Nidek RT-2100 User manual

NIDEK

REFRACTOR

Model RT-2100

OPERATOR’S MANUAL

* Specifications are subject to change without notice for improvement.

NIDEK CO., LTD. : 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan
(Manufacturer) Telephone: [phone]

Facsimile: (0533) 67-6610

NIDEK CO., LTD : 6th Floor, Takahashi Bldg., No.2, 3-chome, Kanda-jinboucho
(Tokyo Office) Chiyoda-ku, Tokyo 101-0051, Japan

Telephone: [phone]
Facsimile: [phone]
Telex: 2226647 NIDEK J

NIDEK INCORPORATED : 47651 Westinghouse Drive Fremont, California 94539, U. S. A.
(United States Agent) Telephone: [phone]

Facsimile: [phone]

NIDEK SOCIETE ANONYME : Europarc 13, rue Auguste Perret, 94042 CRETEIL, France
(Authorized Representative) Telephone: [phone]

Facsimile: (01) 49 80 32 08

2002.11

34060-P902O

Printed in JAPAN

BEFORE USE, READ THIS MANUAL.

This Operator’s Manual contains the operating procedures, safety precautions and
specifications for the R T-2100 when it is used in combination with the following chart
presenting devices.

In this manual, JIS, IEC 60601 and UL standards are applied.
The refractor head complies with ISO 10341 (Ophthalmic instruments - Refractor heads).

The dioptric powers are indicated with a reference wavelength of 546.07 nm.

For correct use, it is necessary that the contents of this manual, in particular the safety
precautions and operating procedures, are thoroughly understood before using the
instrument.

Keep the manual handy for reference.

There are no user-serviceable parts inside the instrument except printer paper and fuses.
Therefore, if you encounter any problems or have questions about the instrument during
use, contact your authorized distributor.

*1 Chart presenting devices used in combination with the RT-2100

• NIDEK SPACE SAVING CHART SSC-300/SSC-330/SSC-350

• NIDEK CHART PROJECTOR CP-670/CP-690

*2 Figures of the control box and charts for CP-690 Type U are used in this manual.

*3 In this manual, visual acuity is represented by fractions (feet). For VA values

represented by decimals or fractions (meters), see “Appendix. C Conversion table
for VA values” at the back of this manual.

(This applies only to equipment whose power source is 100/120 Vac.)

Table of Contents

§

1 INTRODUCTION........................................................................................................1-1

1.1 Outline of the Instrument ......................................................................................... 1-1

1.2 Classifications .......................................................................................................... 1-1

1.3 Symbol Information .................................................................................................1-2

§

2 SAFETY ........................................................................................................................2-1

2.1 Operation.................................................................................................................. 2-1

2.2 Storage......................................................................................................................2-2

2.3 Installation ................................................................................................................ 2-3

2.4 Wiring....................................................................................................................... 2-4

2.5 After Use .................................................................................................................. 2-4

2.6 Maintenance .............................................................................................................2-4

2.7 Disposal.................................................................................................................... 2-5

2.8 Labels ....................................................................................................................... 2-6

§

3 CONFIGURATIONS ...................................................................................................3-1

3.1 Refractor Head ......................................................................................................... 3-1

3.2 Control Box .............................................................................................................. 3-3

3.3 Relay Box ............................................................................................................... 3-13

Page

§

4 OPERATING PROCEDURE...................................................................................... 4-1

4.1 Operation Flow......................................................................................................... 4-1

4.2 Power-ON................................................................................................................. 4-2

4.3 Entering Data............................................................................................................ 4-2

4.3.1 Receiving data from the auto refractometers .................................................. 4-2

4.3.2 Receiving data from the lensmeter.................................................................. 4-3

4.3.3 Manual entry with the dial .............................................................................. 4-4

4.3.4 Entering data via an IC card

(available only if the RT is equipped with the IC card system).......................4-5

4.3.5 Setting prism lenses ........................................................................................4-7

4.3.5.1 Switching coordinates between rectangular and polar ........................ 4-7

4.3.5.2 Setting rectangular coordinates (XY).................................................. 4-7

4.3.5.3 Setting polar coordinates (rθ).............................................................. 4-8

4.3.5.4 Recording “Blur”, “Break” and “Recovery” ....................................... 4-8

4.3.5.5 Removing and replacing prism lenses................................................. 4-9

4.3.5.6 Clearing prism data ........................................................................... 4-10

4.4 Initial Setups........................................................................................................... 4-11

4.5 Refraction with the Standard Program ...................................................................4-12

4.5.1 Program A .....................................................................................................4-12

4.6 Chart Presentation ..................................................................................................4-21

4.6.1 Chart selection............................................................................................... 4-21

4.6.2 VA chart masking .......................................................................................... 4-21

4.7 Adjustment of Powers (Final Fit)...........................................................................4-24

4.7.1 Auto adjustment of Far Powers.....................................................................4-24

4.7.2 Fine adjustment after auto adjustment (Semi-auto adjustment).................... 4-26

4.7.3 Manual adjustment of powers .......................................................................4-27

4.8 After Use Care........................................................................................................ 4-27

§

5 OTHER FUNCTIONS.................................................................................................5-1

5.1 Programming ............................................................................................................ 5-1

5.1.1 Deleting programs........................................................................................... 5-1

5.1.2 Programming...................................................................................................5-2

5.1.3 Starting a programmed refraction ...................................................................5-4

5.2 Printout ..................................................................................................................... 5-4

5.2.1 Changing an ID No. ........................................................................................ 5-6

5.2.1.1 Outputting all the data displayed on the screen................................... 5-6

5.2.2 Entering comments for printout ......................................................................5-7

5.2.3 Entering date and time ....................................................................................5-8

5.3 Displaying a Data List .............................................................................................. 5-9

5.4 Setting Auxiliary Lenses ..........................................................................................5-9

5.5 Parameter Settings..................................................................................................5-10

5.6 Recalling Data ........................................................................................................ 5-17

5.6.1 Calling up final data ...................................................................................... 5-17

5.6.2 Calling up the most recent data.....................................................................5-18

5.7 Fogging Function with Both Eyes Open ................................................................5-19

5.8 Linkage OFF Function ........................................................................................... 5-20

5.9 Clearing the Saved Data in Memory ......................................................................5-20

§

6 METHOD OF SINGLE TESTS .................................................................................6-1

6.1 Unaided Visual Acuity Test......................................................................................6-1

6.2 Aided Visual Acuity Test .........................................................................................6-2

6.3 Visual Acuity Test Aided with Addition Power ....................................................... 6-3

6.4 Cylinder Tests...........................................................................................................6-4

6.4.1 Cylinder test with astigmatism clock dial .......................................................6-4

6.4.2 Cylinder test with XC lens ..............................................................................6-5

6.5 Spherical Refinements..............................................................................................6-5

6.5.1 Red/Green test.................................................................................................6-5

6.5.2 Cross Grid test for far vision...........................................................................6-6

6.6 Binocular Vision Function Test ................................................................................ 6-7

6.6.1 Binocular balance test .....................................................................................6-7

6.6.2 Polarized Red/Green test................................................................................. 6-9

6.6.3 Phoria test...................................................................................................... 6-10

6.6.3.1 For CP-690(670) TYPE U / SSC-330(300) TYPE U ....................... 6-10

6.6.3.2 For CP-690(670) TYPE T and F / SSC-330(300) TYPE T .............. 6-12

6.6.4 Phoria with fixation test ................................................................................6-14

6.6.5 Von Graefe test (for horizontal phoria) ......................................................... 6-16

6.6.6 Von Graefe test (for vertical phoria) .............................................................6-17

6.6.7 Vertical coincidence test................................................................................6-19

6.6.8 Horizontal coincidence test ........................................................................... 6-21

6.6.9 Schober test ...................................................................................................6-23

6.6.10 Stereo test .................................................................................................... 6-25

6.6.10.1 For SSC-350 TYPE T/TCG ............................................................6-25

6.6.10.2 For the others................................................................................... 6-25

6.6.11 Worth test .................................................................................................... 6-26

6.6.12 Maddox test (for horizontal phoria) ............................................................6-27

6.6.13 Maddox test (for vertical phoria) ................................................................ 6-28

6.6.14 Negative relative convergence test.............................................................. 6-29

6.6.15 Positive relative convergence test ...............................................................6-30

6.6.16 Near point of convergence test.................................................................... 6-31

6.6.17 Near point of accommodation test .............................................................. 6-32

6.6.18 Negative relative accommodation test ........................................................ 6-33

6.6.19 Positive relative accommodation test.......................................................... 6-34

§

7 COMMON PROBLEMS AND SOLUTIONS...........................................................7-1

§

8 MAINTENANCE .........................................................................................................8-1

8.1 Cleaning the Forehead Rest...................................................................................... 8-1

8.2 Cleaning the Face Shields ........................................................................................ 8-2

8.3 Replacing the Printer Paper...................................................................................... 8-2

8.4 Cleaning the Measuring Windows ...........................................................................8-4

8.5 Cleaning the Exterior ...............................................................................................8-4

8.6 Replacement Part No. for Printer Paper ...................................................................8-4

§

9 SPECIFICATIONS ......................................................................................................9-1

§

10

ACCESSORIES..........................................................................................................10-1

10.1 Standard Accessories............................................................................................ 10-1

APPENDIX. A Descriptions of power adjustment................................................................. A-1

APPENDIX. B Linkage between charts and auxiliary lenses ................................................ B-1

APPENDIX. C Conversion table for VA values .................................................................... C-1

APPENDIX. D Preset Addition Power .................................................................................. D-1

APPENDIX. E Table for VA values as presented on charts................................................... E-1

APPENDIX. F Examples of Programming .............................................................................F-1

§

1

1.1 Outline of the Instrument

The NIDEK REFRACTOR Model RT-2100 is a computerized refractor used for subjective
refraction when connected to the NIDEK AUTO REFRACTOMETER (AR), AUTO REF/
KERATOMETER (ARK) and AUTO LENSMETER (LM)*1. The operator has a fully integrated
refraction system that simplifies and speeds up refraction.

The RT-2100 includes a refractor head, a control box, a relay box and a printer.

The relay box serves as a link to the refractor head, control box and printer, and also functions as
a communication link to the AR and/or LM.

The control box provides a display for viewing measurements. The control panel allows the
operator to perform most operations from an integrated console by linking the refractor and the
connected chart presenting device. Both instruments can be operated from the single control
box.

INTRODUCTION

Normally , the relay box and the printer are contained in the system table (not included in the RT­2100 package.)

1.2 Classifications

[Classification under the provision of 93/42/EEC (MDD)] Class I

The RT-2100 is classified as a Class I instrument.

[Form of protection against electrical shock] Class I

The R T-2100 is classified as a Class I instrument. A Class I instrument is an instrument in which
protection against electric shock does not rely solely on basic insulation. A Class I instrument
includes additional safety precautions that provide for connection of accessible conductive parts
to a protective (earth) grounding conductor in the fixed wiring of the installation.

[Degree of protection against electrical shock] Type B applied part

The RT-2100 is classified as an instrument with a Type B applied part.
A Type B applied part provides an adequate degree of protection against electrical shock,
particularly regarding the following:

- allowable leakage currents

- reliability of the protective earth ground connection (if applicable)

*1 Connectable instruments

AR: NIDEK AR-20, ARK-30, AR-600, AR-600A, AR-660A, ARK-700, ARK-700A, ARK­760A, AR-800, AR-820, AR-860, ARK-900, AR-1000, AR-1100, AR-1200M, AR-1600, ARK­2000, ARK-9000, ARK-10000
LM: NIDEK LM-770, LM-820A, LM-870, LM-990, LM-990A

1 - 2

[Degree of protection against liquid entry] IP20

The RT-2100 is classified as a normal instrument, as such provides only minimal protection
against liquid intrusion. The enclosure of the RT-2100 is not completely water proof.
Avoid immersion of any king.

[Degree of protection against flammability]

The RT-2100 is classified as an instrument not suitable to be used in a potentially flammable
environment.
Do not operate the instrument near flammable materials.

[Mode of operation]

Continuous operation

[Method(s) of sterilization or disinfection recommended by the manufacturer]

The RT-2100 does not have any parts to be sterilized or disinfected.

1.3 Symbol Information

This symbol on the instrument indicates that caution should be taken. Refer to the
Operator’s Manual before operating the instrument.

This symbol indicates that the instrument is classified as an instrument with a Type B
applied part.

This symbol on the power switch indicates that the power is ON.

This symbol on the power switch indicates that the power is OFF.

This symbol indicates the proper fuse rating of the device.

This symbol indicates that the instrument must be supplied only with an alternating
current.

1 - 3

The symbols printed on the control box and shown on the display correspond to the symbols and
those names defined in ISO 10341 (Ophthalmic instruments - Refractor heads) as shown in the
following table.

Auxiliary lens

Marking

RT-2100 ISO10341

Red maddox rod or MR Maddox rods

Pinhole plate PH or Pinhole

Occluder BL or Occluder

PD check lens CL or Cross line

Red filter RF Red filter

Green filter GF Green filter

Polarizing filter or PF Polarization filter

Open aperture OA Open aperture

Lenses for retinoscope RL Retinoscopic lens

§

2

The following safety precautions should always be followed.

In this manual, Signal Words are used to designate a degree or level of safety alerting.
The definitions are as follows.

WARNING: Indicates a potentially hazardous situation which, if not avoided,

could result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided,

may result in minor or moderate injury or property damage.

Even cases mentioned in CAUTION may result in serious injury under certain
conditions. Be sure to observe the instructions of CAUTION.

2.1 Operation

SAFETY

WARNING

• When moving the refractor head in front of or away from the patient, make sure that there
are no obstacles in its path.

Inadvertent contact with a person or object could result in personal injury and/or damage
to the instrument.

CAUTION

• Never disassemble or tamper with the inside of the instrument.

This may result in an electric shock or an instrument malfunction.

• Be sure to use an electrical current which meets the power specification requirements.

If the line voltage is too high or too low , it may af fect the performance of the instrument
and may start an electrical fire.

• Always remove the power cord from the wall outlet by holding the plug. Never pull on
the cord.

This can damage the internal wires and may result in a short circuit, an electric shock or
a fire.

• If the internal wires of the power cord are exposed, the power to the instrument will be
inconsistent, or the plug will become extremely hot, indicating internal damage to the
cord. If this occurs, remove the cord from the outlet immediately. After checking to see
that no more smoke is being produced, contact your authorized distributor immediately.

If the instrument is not functioning normally , it may cause an electric shock or a fire.

CAUTION

• Do not crush or squeeze the power cord with heavy objects.
If the power cord is damaged, it may cause an electric shock or a fire.

• Clean between the prongs of the power plug using a dry cloth every couple of months.
If the prongs are exposed to moisture or excessive dirt, the instrument may short circuit
or cause a fire.

• If you notice strange odors or smoke being emitted from the instrument, turn OFF the

instrument, and disconnect the power cord immediately. After confirming that smoke is
no longer being produced, contact your authorized distributor .

If the instrument is used under abnormal conditions, it may cause an electric shock or a
fire.

NOTE

2 - 2

• Do not touch the measuring windows.
Dirt or fingerprints on the measuring windows may affect the accuracy of the refraction
data.

• Be sure to wipe the forehead rest and face shields with a clean cloth and a diluted neutral

detergent solution before each examination.

2.2 Storage

NOTE

• Do not store the instrument in a place where it may be exposed to moisture or toxic

chemicals.

• Avoid storing the instrument in an area with excessive heat, humidity, or dust.
To preserve the appearance of the instrument, avoid direct exposure to sunlight.

2 - 3

2.3 Installation

WARNING

• The refractor head weights 6.7 kg. Make sure that the refractor’s arm has been designed
to bear the weight.

Before attaching the refractor head to the arm, impose weight on the arm, and confirm
that the refractor head is stable during normal use.

• Be sure to secure the refractor head to the refractor arm with the set screw.

If the refractor head is dropped or falls, it could cause extensive damage and possible
injury.

NOTE

• Store the instrument in the following conditions.

Temperature: 10 - 40 °C
Humidity: 30 - 85 %
A dust free environment
Minimal exposure to direct sunlight
An area free of vibration

• Be sure to level the refractor head before use.

If it is not level, the accuracy of the refraction data may be affected. Level the refractor
head by turning the Leveling adjustment knob until the bubble is centered in the level.

• This instrument has been tested and found to comply with the limits for medical devices
to the IEC 60601-1-2: 1993, EN60601-1-2: 1994, Medical Device Directive 93/42/EEC.
These limits are designed to provide reasonable protection against harmful interference
in a typical medical installation. This instrument generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to other devices in the vicinity . However , there is no guarantee
that interference will not occur in a particular installation. If this instrument does cause
harmful interference to other devices, which can be determined by turning the instrument
off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:

- Reorient or relocate the receiving device.

- Increase the separation between the instruments.

- Connect the instrument to an outlet on a circuit different from that to which the other
device(s) are connected.

- Consult the manufacturer or field service technician for help.

2.4 Wiring

CAUTION

• Be sure to use a (HOSPITAL GRADE) wall outlet equipped with a grounding terminal
in order to avoid an electric shock or fire in the event of a power leak.

• Be sure the plug is securely in place in the wall outlet.

Insecure connections may affect the operation of the instrument or create a fire hazard.

2.5 After Use

CAUTION

• If the instrument will not be used for an extended period, disconnect the power plug from
the wall outlet.

If the instrument is covered with dust and it takes on moisture, it may create a fire
hazard. Always use the dust cover supplied with the instrument.

2 - 4

NOTE

• When the instrument is not in use, turn OFF the power switch and put the dust cover on.

If the instrument is not covered for an extended period, the accumulation of dust may
affect the accuracy of the instrument.

2.6 Maintenance

NOTE

• Never use an organic solvent or abrasive solvent to clean the exterior of the instrument as
it may ruin the appearance.

• When the instrument is sent back to NIDEK for repair or maintenance, wipe the surface
(especially , the area where the patient’s skin contacts) of the instrument with a clean cloth
immersed in ethyl alcohol for disinfection.

2 - 5

2.7 Disposal

NOTE

• Follow local governing ordinances and recycling plans regarding disposal or recycling of
device components.

Especially the disposal method of lithium batteries varies according to the government.
As the relay and control boxes have lithium batteries on the circuit boards, follow the
local governing ordinances and recycling plans when disposing of a circuit board with
lithium batteries.

• When disposing of packing materials, sort them by material and follow local governing
ordinances and recycling plans.

2.8 Labels

• Labels provide safety information about each part.

2 - 6

Relay box

For 100V area

For 200V area

For 100V area For 200V area

Refractor head

2 - 7

Control box

CB NO. NNNN

2 - 8

§

3

3.1 Refractor Head

Operator’s side

Near point card

Level

Forehead rest knob

CONFIGURATIONS

Near point rod

Level adjustment knob

Chart check mirror

Vertex distance check windows

Patient’s side

Measuring

windows

Lens banks

Forehead rest

Measuring windows

Face shields

3 - 2

Measuring windows

Patients look at the chart through these win­dows.

Vertex distance check windows

Used to check the patient’ s VD (the distance
from a corneal vertex point to the lens).
The window has calibration markings of 12,

13.75, 16, 18 and 20 mm.

Forehead rest knob

Used to move the forehead rest forward and
backward in order to adjust the vertex dis­tance (VD).

Level

Used to verify that the refractor head is level.
Turn the level adjustment knob until the air
bubble is centered in the level.

Near point rod

The distances from the patient’s eye to the
near point card is marked in inches and centi­meters.

• The black line at the near point card holder
is aligned with the tick of the desired dis­tance.

• The red number represents the power (di­opter), the reciprocal of each distance in
meters.

Adjust the chart to a
desired distance from
the patient’s eyes and
tighten the knob to fix
the position.

Near point card

Used for Addition Power measurement.

Number of the chart

Chart

Name of the chart
on the rear side

The refracting distance is printed at the top
of the card.

Level adjustment knob

Used to adjust the level of the refractor head.
It can be inclined 2.5º toward the left or right
at the maximum.

Chart check mirror

An operator confirms the selected chart with
this mirror.

Forehead rest

Patient’s forehead should touch the rest dur­ing measurement. Clean it before each mea­surement.
See “8.1 Cleaning the Forehead Rest”. (p. 8-

1)

Face shields

Patient’s face touches the shields during mea­surement. Clean them before measurement.
See “8.2 Cleaning the Face Shields”. (p. 8-2)

Explanation of the chart

3 - 3

3.2 Control Box

The blue colored keys are used for basic operation.
* Some switches function differently when they are used in conjunction with .

In this manual, when you see instructions such as: “ + ”, it means “Press the
key while pressing the key.”

Display

Chart keys

Masking keys

Contrast adjustment knob

3 - 4

Display

Shows SPH, CYL, AXIS data and the chart
that is being presented.

Date

Time
Previous data window

(Sub-window)
Current data window

(Main window)
Present chart

Contrast adjustment knob

Used to adjust the contrast of the display.

Chart keys

Used to select charts.

Masking keys

Used to isolate any acuity line or letter on the
chart that has been selected.
To remove the mask, press any of the chart
keys.
VA (V isual Acuity) of the selected line or let­ter is shown at “VA” on the Main window of
the display .

- 2 ,

Used to isolate a vertical line on the VA chart.

• Used to move the isolation to the right or
left after the vertical line mask or a single
letter mask has been applied.

• + / ⇒ Isolates a single let­ter at the lower-left or lower-right corner of
a VA chart.

- 3

Used to isolate a single letter at the upper­right corner of a VA chart.

• + ⇒ Isolates a single letter at the
upper-left corner of a VA chart.

- 4

Used to isolate a middle line of a VA chart.

• + ⇒ Adds the Red/Green filter
to a VA chart that has been selected.
Again, + ⇒ Releases the Red/
Green filter.

- 1 ,

Used to isolate a horizontal line (letters of the
same VA) on the VA chart.

• Used to move an isolation up and down af­ter the mask has been applied.

• + ⇒ A horizontal line mask
will be applied to the top line of the chart.

+ ⇒ A horizontal line mask

will be applied to the bottom line of the
chart.

3 - 5

Eye selection keys

Keys of Control Box

Value change keys

Cross cylinder keys

Program keys

For more information on using the pro­grammed refraction sequence, see “4.5 Re­fraction with the Standard Program” (p. 4-12).

- 1

Starts a program.

• Press to start a programmed refraction se­quence and activate the initial steps.

• + ⇒ Switches among program
modes (A, B, C, D, E) in order.

0':6

- 2

Used to progress through each step of a pro­grammed refraction sequence.

• +

0':6

⇒ Allows the user to go back

to a previous step in the refraction program.
(This key combination is inoperative while
in the Final Fit mode.)

Program keys

Dial

Dial

Changes any highlighted value.
Turn it clockwise ⇒ The value changes to
the negative.
Turn it counterclockwise ⇒ The value
changes to the positive.
The highlighted value changes by turning the
knob while holding down.

Cross cylinder keys

Place a cross cylinder lens to refine axis or
Cylindrical Power.
When it is pressed during binocular tests, the
left measuring window is covered in order to
allow testing of the right-eye only.
T o perform the test with both windows open,
press of the covered-side window.
The 0.25 or 0.50 diopter lens should be se­lected in the “XC test” parameter of “Set pa­rameter 1/5” screen prior to testing. A cross
cylinder lens will be inserted as follows un­less “Auto” is selected instead of “XC test”
of “Set parameter 1/5”.

:%

- 1

• During axis refinement, the cross cylinder
lens is inserted so that the minus axis is lo­cated at 45º from the minus axis position of
the cylinder lens.

• During Cylindrical Power refinement, the
cross cylinder lens is inserted so that the mi­nus axis is located at 90º from the minus
axis position of the cylinder lens.

• When using the Prism refinement mode (BI/
BO), this switch can be pressed to clear out
the values and start at zero in the right eye.

:%

- 2

• During axis refinement, the cross cylinder
lens is inserted so that the minus axis is lo­cated at 135º from the minus axis position
of the cylinder lens.

• During Cylindrical Power refinement, the
cross cylinder lens is inserted so that the mi­nus axis is located 0º from the minus axis
position of the cylinder lens.

• When using the Prism refinement mode (BI/
BO), this key can be pressed to clear out
the values and start at zero in the left eye.

• Press this key while pressing and the
time display changes to the stopwatch dis­play . This enables you to measure how long
the test took and this function is sometime
used for special tests to be carried out in a
few seconds.

Value change keys

Provides the same function as the dial.

- 1

A value increases by increments of 1 each
time it is pressed.

3 - 6

Eye selection keys

Used to select right eye (R), left eye (L), or
both eyes (BIN) for subjective measurements.

• The measuring window of the non-selected
eye will automatically be covered. How­ever, the occluder will not be inserted dur­ing binocular testing using prism lenses or
polarizing filters.

• +
nant eye.

will be shown next to R or L on the
measurement screen to indicate the domi­nant eye.

- 1

4

Leaves open or opens the right measuring
window and leaves closed or closes the left
measuring window. If a binocular testing
chart is selected and binocular testing is de­sired, the left measuring window will not be
covered and the right eye value is highlighted.
In this situation, only right eye data can be
adjusted.

- 2

.

Leaves open or opens the left measuring win­dow and leaves closed or closes the right mea­suring window . If a binocular testing chart is
selected and binocular testing is desired, the
right measuring window will not be covered
and the left eye value is highlighted. In this
situation, only left eye data can be adjusted.

- 3

Keeps or makes both measuring windows
open. When changing values in this situa­tion, data of both eyes can be changed to the
same values with each adjustment.

or

4

⇒ Specifies the domi-

.

- 2

A value decreases by increments of 1 each
time it is pressed.

3 - 7

Keys of Control Box

Key

Key

Input key

Print key

Shift key

Data keys

Data keys

Used to specify the field for receiving data or
storing measurements.
Measurements in the specified field are shown
on the main window.
The specified field will be indicated at the up­per-left corner of the main window.
If one of the data keys is pressed without re­ceiving data from an AR or LM, then the cur­rent measurements which have been on the
main window, will be copied to the corre­sponding field to the selected data.
If one of these keys is pressed while holding

down, measurements on the screen will
be copied to the corresponding field regard­less of whether any data has been received
and stored.
T o enter data to the RT-2100, see “4.3 Enter­ing Data” (p. 4-2)

70

- 1

#+&'&

Used to open the field for measuring unaided
visual acuity. The corrective lens power in
the refractor head will be set to 0 D.

- 2

Used to open the field for receiving
lensometry data.

- 3

Used to open the field for receiving auto-re­fractometry or retinoscopic measurements.

- 4

Used to open the field for subjective refine­ment. When data is received from the AR or
LM, this field will automatically open. The
elapsed time starts to be measured from the
point where any data is entered to the SUBJ
field when the “Auto test time” parameter is
set at “Yes”.

3 - 8

- 5

Used to open the field for obtaining a final
prescription and visual acuity.
The refined values are copied from the
“SUBJ” field and are adjusted to determine
final data.

+ ⇒

This will automatically activate the Final Fit
mode where Far Powers are automatically
adjusted. (See “4.7.1 Auto adjustment of Far
Powers”.) (p. 4-24)

While holding down this key, indication in­crements change or modes change when the
dial is turned or when a key is pressed.

24+06

Used to print out measurements or to export
data to an external computer . See “5.2 Print­out” (p. 5-4)

Used to open the measuring window . Auxil­iary lenses will be removed.

+ Right ⇒

6 ∆ base UP prism lens will be placed in the
right measuring window . It appears to the pa­tient that one chart is dissociated into the up­per and lower parts. Used to detect horizon­tal phoria.

+ Left ⇒

10 ∆ base IN prism lens will be placed in the
left measuring window . It appears to the pa­tient that one chart is dissociated into the left
and right parts. Used to detect vertical pho­ria.

+0

Used to receive data from the LM or AR.
Press the key and make sure that the data No.
on the display is the same as the one on the
printout from the LM or AR. Specify either
( , ) with the data keys.

Used to close the measuring windows. Used
for monocular testing or cover testing.

+ ⇒ Insert a pinhole plate with

a diameter of 1 mm.

• The Focal depth of the eye becomes deeper.

• Can be used when visual acuity obtained
with the corrective lenses is below expec­tations. If the pinhole improves the patient’ s
VA, the eye may have an irregular astigma­tism.

3 - 9

Setting keys

C+/– key

Keys of Control Box

F/N key

Mode keys

Function keys

Clear key Help key

Setting keys

Used to open the field for changing param­eter settings or programming refraction.
See “§5 OTHER FUNCTIONS”. (p. 5-1)

- 1

Used to open the “Set up menu” screen.

- 2 ,

Used to select a menu option.
These keys are also used to adjust the chart
position when the SSC-300/SSC-330/SSC­350 is connected to the RT-2100.
When programming, they are used to select
the comments. See “5.1.2 Programming” (p.
5-2).

+ ⇒ *

2

Makes the intensity of the glare lamp higher
by one increment while the glare lamp is illu­minated. The brightness, however, does not
change when the lamp intensity is the highest
even though these switches are pressed.

+ ⇒ *

2

Makes the intensity of the glare lamp lower
by one increment while the glare lamp is illu­minated. The brightness, however, does not
change when the lamp intensity is the lowest
even though these switches are pressed.

- 3

Used to determine the selected menu options.
If the RT-2100 interfaces with the SSC-300/
SSC-330/SSC-350, this key is used to adjust
the chart position. See “4.4 Initial Setups”
(p. 4-11).

+ ⇒ *

2

Turns the glare lamp ON/OFF.

*'.2

Used to call up on-screen explanations and
instructions for the selected chart.
To cancel, press the key again or press the
function key which corresponds to .

END

*2 This function is available only when the optional glare lamp is attached to the connected SSC-

330.

Switches Cylindrical Power to either + or –.

3 - 10

- 1

Places the system into the SPH mode which
allows Spherical Power to be adjusted.

Switches to either the Distance (Far) mode
or Near mode. The selected mode is indi­cated in the upper-right corner of the main
window as “FAR” or “NEAR”.

• The system will automatically operate in the
Far mode when the power is turned ON and
after data is cleared.

• The Near mode is used after distance vi­sion has been refined and Addition Power
has been calculated in order to perform near
vision function testing such as relative ac­commodation and horizontal or vertical
phoria testing. When the Near mode is se­lected, both lens banks will converge to the
preset working distance of 40 cm (variable)
automatically.

• The ADD key will not work in the Near
mode. The Near SPH value will be calcu­lated by adding ADD value to the distance
SPH value (distance SPH + ADD). It is
also possible to transfer the distance SPH
value alone into the Near mode by select­ing the “SPH + ADD” option in the “SPH
Far → Near” parameter .

Mode keys

Selects the measurement field in which
measurements are to be refined (or changed).
Once the field is selected, a data field will be
highlighted, indicating that changes can be
made.
The measurement can be changed with the
dial or , .

- 2

Places the system into the CYL mode which
allows Cylindrical Power to be adjusted.

- 3

Places the system into the AXIS mode which
allows the cylindrical axis to be adjusted.

- 4

Places the system into the ADD mode which
allows the Addition Power to be adjusted.*
Both lens banks will automatically converge
to the preset working distance of 40 cm (vari­able). See the explanation of “Working dist.
(WD)” parameter. (p. 5-13).

• When the “Preset ADD” parameter is set to
“Yes”, the patient’s general age can be se­lected*4 and the expected spherical lens will
be inserted and Addition Power will be dis­played.

• Each time the key is pressed, a spherical lens
with an Addition Power will be added or
removed alternately and the lens banks will
remain converged.
The reversed ADD indicator on
the main window will change to
and date indication will also change to
“ADD-OFF” showing that the lens is re­moved.
By pressing again, the Addition
Power indicator will be highlighted and the
addition power of the lens will be added.

3

*3 When the system is placed into the ADD mode during standard program (Program A) operation,

±0.5 D cross cylinder lens (minus axis: 90°) will automatically be placed into the measuring
windows. The ±0.5 D cross cylinder lens will not be inserted when is pressed during
non-programmed measurement.
To insert the ±0.5 D cross cylinder lens, press .

*4 The expected spherical lens with Addition Power will automatically be added according to the

selected age. See “Appendix. D Preset Addition Power”.

3 - 11

After entering Addition Power, the working
distance indications appear and the desired
working distance can be selected with the cor­responding function key .
The procedure for removing and setting Ad­dition Power is the same as that for prism
lenses. See “4.3.5.5 Removing and replac­ing prism lenses”. (p. 4-9)
It is possible to switch fields among LM, AR,
SUBJ and FINAL on condition that the lens
banks are converged in the ADD mode.

• +
Used to place the system in the mode
which allows the values for NPC, NPA,
NRA and PRA*5 to be entered.
For the procedures of each test, see Ҥ6
METHOD OF SINGLE TESTS”. (p. 6-1)

- 5

Allows the user to manually enter visual acu­ity with the dial.
When AR or LM data has been entered and
“UNAIDED” or “LM” field key is pressed,
an expected VA chart will be presented.*

6

- 6

Allows the user to select a patient ID No.,
which will be printed out and can be used as
a communication ID for patient records in a
PC.
See “5.2.1 Changing an ID No.”. (p. 5-6)

- 7

Displays PD measurement and allows the user
to adjust the PD measurement in the refrac­tor head.
Monocular PD (1/2 PD)*7 ⇒ Adjustments
can be made after pressing either

or

4

.

while in the PD mode.
To exit from the mode ⇒ Press again.

- 8

Allows the user to adjust base IN/OUT prism
values for horizontal measurements. Either
rectangular coordinates or absolute values for
polar coordinates may be entered and ad­justed. See “4.3.5 Setting prism lenses” for
procedure for adjusting Prism Power. (p. 4-

7)

- 9

Allows the user to adjust base UP/DOWN
prism values for vertical measurements. Ei­ther rectangular coordinates or angle for po­lar coordinates may be entered.

Function keys

Used to select functions displayed on the bot­tom of the main window.

%.'#4

Clears all the data displayed in each field, on
the measurement screen. To delete data in
each field, press this key simultaneously with

70

, , , or .

#+&'&

*5 NPC: Near Point of Convergence NPA: Near Point of Accommodation

NRA: Negative Relative Accommodation PRA: Positive Relative Accommodation

*6 The expected VA chart will be presented only on condition that the parameter “Preset VA” is

set to “1 letter” or “H. line”. For the type of the presented VA chart, see “Appendix. E Table
for VA values as presented on charts”.

*7 Even when the monocular PD for only one eye is changed, both the left and right lens banks

move concurrently .

Keys of Control Box

* Only when using the SSC-350 TYPE T/TCG in combination with the RT-2100

3 - 12

Glare key Low illumination key Contrast key

The following keys are used only when the RT-2100 is used in combination with the SSC-350
TYPE T/TCG.

Turns ON or OFF the glare lamp. (Only the
SSC-350 TYPE TCG)

Used to test at night.

Pressing the key switches between low
light and standard light illuminations.

Selects the contrast of charts.

Pressing the key changes the contrast in
the order of 25% → 12% → 6% → 100%
(standard light illumination). (Only the
SSC-350 TYPE TCG)

3 - 13

3.3 Relay Box

Normally, the relay box is contained in the system table.

Connector for AR*

Power connector
for IC card
Reader/Writer*

Connector for control box

8

Connector for AR*

8

Connector for LM*

8

Connector for external
computer*

Connector for
printer

8

8

Connector for
chart presenting

8

device*

Connector for
refractor head

Connector for
network (optional)*

Terminator

CB NO. NNNN

Fuse holder

8

Power switch

Power connector

Terminator

Port to connect the relay box to an Auto-Re­fractometer or IC card Reader/Writer.

Connector for LM*

8

Port to connect the relay box to a lensmeter.

Connector for external computer*

8

Port to connect the relay box to an external
computer.

Connector for chart presenting device

8

*

Port to connect the relay box to a chart pre­senting device.

Connector for network*

8

Port to connect the relay box to an external

Used only when more than one refractor is
used on a network. Normally, set at “1”.

Connector for refractor head

Port to connect the relay box to the refractor
head.

Connector for printer

Port to connect the relay box to the printer.

Connector for control box

Port to connect the relay box to the control box.

Power connector for IC card Reader/Writer*

Port to connect IC card Reader/Writer to a
power source.

computer for networking.

*8 Accessory equipment connected to the analog and digital interfaces must be certified according

to respective IEC standards (i. e. IEC 950 for data processing equipment and IEC 60601-1 for
medical equipment). Furthermore all configurations shall comply with the system standard
IEC 60601-1-1. Anyone who connects additional equipment to the signal input part or signal
output part configures a medical system, and is therefore responsible that the system complies
with the requirements of IEC 60601-1-1. If in doubt, consult NIDEK or your local representative.

8