Mesotest II b |
Instruction Manual
Copyright by |
G/62800/0607/e |
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Instruction Manual Mesotest II
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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
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Instruction Manual Mesotest II
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1. Table of Contents |
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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 |
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4.2. Description of the unit ..................................... |
8 |
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4.3. Description of the control unit ....................... |
10 |
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4.4. Warning signs and labels on the unit …........12 |
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5. |
Proper use.......................................................... |
12 |
6. |
First use of the unit............................................. |
12 |
6.1. Before first use………... ................................12 |
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6.2. Installation and adjustment ........................... |
12 |
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6.3. Instructions on transport and storage ........... |
13 |
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7. |
Operating the unit............................................... |
14 |
7.1. Before each use................................ ............ |
14 |
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7.2. Preparation of the examinee ............... ......... |
14 |
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7.3. The examination procedure .......................... |
15 |
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7.4. Additional examinations................................ |
16 |
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7.5. Evaluation of results ......................... ............ |
16 |
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7.6. After each use .................................... .......... |
16 |
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8. |
Maintenance....................................................... |
17 |
8.1. Care, cleaning and disinfection........... .......... |
17 |
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8.2. Replacing the viewing aperture lining…… .... |
18 |
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8.3. Replacing fuses............................................. |
19 |
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8.4. Replacing the workplace light bulb................ |
19 |
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8.5. Solving problems and malfunctions.......... .... |
20 |
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8.6. Maintenance: description and intervals......... |
20 |
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9. |
Disposal.............................................................. |
20 |
10. Terms of warranty and service ........................ |
21 |
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10.1. Terms of warranty ......................... ............. |
21 |
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10.2. Liability for malfunctions or damage............ |
22 |
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10.3. Manufacturer's and service address........... |
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11. Appendix........................................................... |
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11.1. Literature references ................................ |
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11.2. Declaration of compliance........................... |
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11.3. Order information, accessories and |
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replacement parts....................................... |
24 |
11.4. Technical data ................................. ........... |
25 |
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Instruction Manual Mesotest II
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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.
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Instruction Manual Mesotest II
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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.
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Instruction Manual Mesotest II
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4. Description of the Unit and Its Functions
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4.1. Components of the Unit |
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4 |
5 |
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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
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Instruction Manual Mesotest II
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9 |
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Figure 2 - Mesotest II b, rear view |
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
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Instruction Manual Mesotest II
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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 |
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Contrast |
1:23 |
1:5 |
1:2,7 |
1:2 |
1:23 |
1:5 |
1:2,7 |
1:2 |
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Glare |
Off |
Off |
Off |
Off |
On |
On |
On |
On |
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Automatic |
LO |
RO |
O |
U |
RU |
U |
LU |
O |
Land.sett. |
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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.
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