Visual aptitudes

Reference: PVM-AC

The visual aptitudes program of the Vision Monitor includes standard tests for visual acuity (ETDRS) with an automated scoring and the possibility to record and print the results.

In addition, it includes tests answering new needs for visual function testing in relationship with the quality of life of patients. The "classic" tests used for assessment of visual functions are performed with optimal conditions such as high luminance and high contrast. Therefore, they are not suitable to reflect visual problems that may appear in specific conditions of every day life such as: vision under low contrast,vision under low luminance, glare test, test for aniseikonia.

Visual acuity (ETDRS)

The ETDRS visual acuity test was developed by the National Institute of Health (FERRIS & al, 1982) as part of a study on early treatment of diabetic retinopathy. It has since become a standard for many clinical assessments. For example, in ARMD, the criteria for starting treatment by anti-angiogenic drugs requires an evaluation of visual acuity with the ETDRS test, possibly supplemented by a contrast sensititity test. These tests include the original ETDRS tests and the the new version of 2000. They can be performed at 13, 8 or 3 ft. They are realized with controlled luminance and contrast. They can be scored with the computer's assistance, recorded and printed.


ETDRS test Metrovision

Vision under low contrast and low luminance

The "classic" visual acuity tests may not detect visual problems appearing under specific conditions which are frequently encountered in every day's life such as low contrast and low luminance. The following tests are designed to evaluate visual acuity under conditions of low contrast (10 percent) and low luminance (1 cd/m2). The test series correspond to the ETDRS series. They can be scored with the computer's assistance.

Additional information:
a program of the measurement of the contrast sensitivity curve is also proposed on the Vision Monitor. It uses contrast systems instead of optotypes.
Click here for the corresponding documentation

ETDRS test Metrovision

Glare test

The glare test simulates night driving conditions which cannot easily be evaluated with the tests currently available to the ophthalmologist.
For the realization of the glare test, the Moncv3 and MonPack3 stimulators are equipped with a lateral high luminance light source.
Optotypes of calibrated low luminance are presented over a dark background. The test is easy to perform and does provide a quantitative score: it consists in counting the number of letters which are correctly identified by the patient despite of the diffusion within the eye.
3 different luminance levels are available: for testing young subject (1 cd/m2), older subjects (5 cd/m2) and abnormal subjects (100 cd/m2)

glare test Metrovision

Color vision test

This test is designed as a simple screening test.
It consists in asking the patient to identify the color of a circle within a presentation time.

Presentation time : 1/25 s ou 1 s.
Distance of test = 2.5 m (8 ft).
Size of tests = 1 degree visual angle.

color test Metrovision

Test for aniseikonia

Aniseikonia corresponds to the difference of size between images seen by both eyes. It is the result of the difference of both eyes optical parameters, for example after a monocular lenticular implant.

This test allows the equalization of the sizes of images perceived by the right and the left eye. It can be performed along the horizontal and vertical axis. The difference in size, given in percentage permits the precise calculation of correcting prescriptions allowing to correct aniseikonia.
test aniséiconie Metrovision

Vision Monitor systems compatible with this program: