Oculus Mesotest II Instruction manual
Mesotest II b
Instruction Manual
Copyright by G/62800/0607/e
Page 2
Instruction Manual Mesotest II
___________________________________________________________________
0. Foreword
Thank you for the confidence which you
have placed in us by buying this OCULUS
product. With this unit you have made your
decision for a modern, thoroughly thoughtout product which has been manufactured
and tested according to the highest quality
standards.
Ongoing research and development at
OCULUS, which are certainly in your
interests as well, may lead to changes in the
design and scope of standard equipment.
The illustrations shown in this Instruction
Manual may therefore differ in some
respects from the unit as delivered.
Our company can look back on a history
extending more than 100 years into the past.
OCULUS today is a medium-sized company
whose only focus is to support physicians
and optometrists in their demanding work
with a line of top-quality products for ocular
examinations and operations.
Your Mesotest II is a free-space unit for
testing mesopic vision and glare sensitivity.
In the early 1960s, OCULUS cooperated
with the University Eye Clinic in Tübingen to
develop and build the world's first unit for
testing mesopic vision and glare sensitivity.
At the beginning of the 1980s, this unit was
further developed even with the help of a
new optical system.
The latest generation, the Mesotest II, has
been further improved by the application of a
new functional principle. The use of an
electronic control system has made it
possible to substantially streamline the unit's
use and operation, which can now optionally
be carried out from a PC. This also permits
the processing of patient data and
examination results.
The instrument´s weight has also been
greatly reduced, facilitating mobile use.
Proper use is indispensable for safety in
working with the unit. Therefore, please
familiarize yourself thoroughly with the
contents of this Manual before using the unit
for the first time.
Should you have questions or desire further
information on your unit, give us a call or
send us a telefax message. Our service
team will be happy to help.
OCULUS Optikgeräte GmbH The Management and Staff
Instruction Manual Mesotest II
Page 3
___________________________________________________________________
1. Table of Contents
Page
0. Foreword ................................................. ............2
1. Table of contents..................................................3
2. Standard equipment list........................................4
3. Safety precautions ...............................................5
4. Description of the unit and its functions ....... .......6
4.1. Components of the unit...................................6
4.2. Description of the unit .....................................8
4.3. Description of the control unit .......................10
4.4. Warning signs and labels on the unit …........12
5. Proper use..........................................................12
6. First use of the unit.............................................12
6.1. Before first use………... ................................12
6.2. Installation and adjustment ...........................12
6.3. Instructions on transport and storage ...........13
7. Operating the unit...............................................14
7.1. Before each use................................ ............14
7.2. Preparation of the examinee ........................14
7.3. The examination procedure ..........................15
7.4. Additional examinations................................ 16
7.5. Evaluation of results .....................................16
7.6. After each use .................................... ..........16
8. Maintenance.......................................................17
8.1. Care, cleaning and disinfection.....................17
8.2. Replacing the viewing aperture lining……....18
8.3. Replacing fuses.............................................19
8.4. Replacing the workplace light bulb................19
8.5. Solving problems and malfunctions.......... ....20
8.6. Maintenance: description and intervals.........20
9. Disposal..............................................................20
10. Terms of warranty and service ........................21
10.1. Terms of warranty ......................... .............21
10.2. Liability for malfunctions or damage............22
10.3. Manufacturer's and service address........... 22
11. Appendix...........................................................23
11.1. Literature references ..................................23
11.2. Declaration of compliance...........................24
11.3. Order information, accessories and
replacement parts.......................................24
11.4. Technical data ............................................25
Page 4
Instruction Manual Mesotest II
___________________________________________________________________
2. Standard Equipment List
- Mesotest II
- Control unit with LCD module and work
area illumination
- Mains cable
- Instruction Manual
- Notepad for test results (100 pages)
- Dust cover
- Metal covering for viewing aperture
If you have also acquired the software
module (cf. Chapter 10.3.), please see the
separate Instruction Manual for this product
and its accessories.
Right reserved to change the scope and
design of standard equipment when
technical development so requires.
Instruction Manual Mesotest II
Page 5
___________________________________________________________________
3. Safety Precautions
The manufacturer is required by law to
inform the user explicitly on safety aspects
involved in dealing with this unit. This
chapter contains a summary of the most
important points to be noted regarding
technical safety.
Other safety precautions are found in the
text of this Instruction Manual
and are designated by
Please pay special attention to these
instructions as well.
Store this Instruction Manual with care in a
place where it is accessible for persons
using the unit at all times; also, give due
attention to Instruction Manuals of the unit's
other accessories as required.
The unit may only be used for its intended
purpose, as described in this Instruction
Manual (chapter 5), and by persons whose
proper use of the unit is ensured by their
training and practical experience.
Use the unit only with original parts and
accessories delivered by us and in a
technically flawless condition. Do not
attempt to use a damaged unit, but contact
your supplier.
Please abide by accident prevention laws
where applicable, and be especially careful
to observe the instructions and information
printed on the unit.
The unit may be used in medical areas only
if these rooms are equipped according to
VDE norms or the equivalent (Association of
German Electrotechnical Engineers).
Always disconnect all mains plugs from their
power outlets before carrying out
maintenance or cleaning work.
Disconnect the mains plug at once if you
notice smoke, sparks, or unusual sounds
coming from the unit. Do not use the unit
again until the problem has been corrected
by our service personnel.
Do not connect electrical plugs and sockets
by force. If it is not possible to connect them,
verify whether the plug is correct for the
socket. If you find damage in either the plug
or the socket, have them repaired by our
service personnel.
Do not disconnect electric plugs from their
sockets by pulling on the cable, but rather
on the plug.
Auxiliary equipment connected to the analog
or digital interfaces of the unit must have
proven compatibility with the EN and/or IEC
specifications of these interfaces.
Furthermore, all configurations must meet
IEC Systems Norm 601-1.
Do not attempt to configure electro-medical
systems by combining the Mesotest II with
non-medical electrical equipment (e.g. data
processing equipment) if this might reduce
the level of patient safety below that
recommended by IEC Norm 601-1. Where
permissible levels for leakage current may
be exceeded due to such combinations,
protective disconnecting devices must be
present.
Do not use the equipment named in the
Standard Equipment List in the following
situations:
- Where there is danger of explosion.
- In the presence of flammable anesthetics
or volatile solvents such as alcohol, benzine
or the like.
Do not store or use the unit in damp rooms.
Avoid placing the unit near dripping,
gushing, or splashing water, and make
certain that no fluid can enter the unit. For
this reason, please do not place any
containers full of liquid on top of the unit,
and also take care when cleaning the unit
with a damp cloth that no fluid gets into the
unit.
Do not cover the ventilation openings.
This unit is a high-quality technical product.
To ensure that it performs flawlessly and
safely, we recommend having the unit
inspected regularly every two years by our
service personnel. Should any problem arise
which you cannot solve using the enclosed
checklist of errors, label the unit "Out of
Order" and contact our service department.
Page 6
Instruction Manual Mesotest II
___________________________________________________________________
4. Description of the Unit and Its Functions
4.1. Components of the Unit
3 4 5
2
1
Figure 1 - Mesotest II, front view
No.1 - Front shell of the housing
No.2 - Lining of the viewing aperture
No.3 - Ventilation openings
No.4 - Clip spring
No.5 - Viewing aperture
Instruction Manual Mesotest II
Page 7
___________________________________________________________________
7
6
11 10 9 8
No.6 - Rear wall of housing
No.7 - Tinted window
No.8 - Mains plug with fuse holder
No.9 - Socket of the serial interface
No.10 - Mains switch
No.11 - Type plate
Figure 2 - Mesotest II b, rear view
Page 8
A
Instruction Manual Mesotest II
___________________________________________________________________
4.2. Description of the Unit
Tests for mesopic vision and glare sensitivity
are an important supplement to tests of
photopic visual acuity, especially when
evaluating the ability to drive at night. Preand postsurgical examination is also to be
recommended for patients undergoing IOL
or refractive surgery, or when tinted lenses
are prescribed.
The Mesotest II is a PD-independent, freespace unit for testing mesopic vision and
glare sensitivity.
"Free-space" means that the test objects
appear under natural visual conditions.
Instrument myopia is eliminated for the most
part, since the eyes accommodate and
converge as in normal vision.
The comfortable, cushioned lining around
the viewing aperture ensures freedom of
viewing and optimum adjustment for all
examinees. The complete elimination of light
from other sources ensures correct
examinations even when room conditions
are only moderately dark.
The ventilation openings of the viewing
aperture lining ensure that condensation
cannot cloud the examinee's glasses or the
unit's occluder.
The test is carried out with optotypes of
different contrast levels. These optotypes
are presented in front of a low-brightness
backdrop.
The light intensity of the backdrop is 0.032
cd/m2 without and 0.10 cd/m2 with glare.
This corresponds to the brightness of
automobile traffic at twilight or at night.
Landolt rings acc. to DIN Norm No. 58220T1 are used as optotypes. Since visual
acuity decreases with decreasing
brightness, acuity level 0.1 is used. The
optotypes can be presented in six different
positions, and one position is preselected
automatically at the beginning of each test.
The Landolt ring positions which are
available for selection are:
LO - Top Left
O - Top
RO - Top Right
LU - Bottom Left
U - Bottom
RU - Bottom Right
Four different contrast levels are available.
They are:
1:23 / 1:5 / 1:2,7 / 1:2.
Here contrast level 1:23 corresponds to the
highest contrast, i.e. this level is the most
easily recognized.
Contrast 1:23 is the ratio between light
intensity of the optotypes and the backdrop.
The contrast levels are presented in each
case with and without glare (=BLEND). This
results in a total of eight tests which run
successively during the course of a test
routine.
Table 1 shows the course of the test routine.
Table 1
Test-No. 1 2 3 4 5 6 7 8
Contrast 1:23 1:5 1:2,7 1:2 1:23 1:5 1:2,7 1:2
Glare Off Off Off Off On On On On
utomatic
Land.sett.
LO RO O U RU U LU O
The viewing screen of the test panel is seen
through an optical system via a
semitransparent viewing mirror. The
optotypes are presented in front of this
viewing screen. Their virtual image appears
at a distance of 5 meters from the eye.
The optotypes are vacuum metallized onto a
glass disk. The projection disk is
manufactured to very tight tolerances for the
various contrast levels.
Loading...