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.
The MonCv3 and MonPackONE stimulators are equipped with a lateral high luminance light source.
Optotypes of calibrated low luminance are arranged in 3 radial lines of letters with increasing eccentricity from the glare source.
The light from the glare source scattered inside the eye creates a halo of light that reduces the contrast of the optotypes positioned near the light source.
The clinical applications of this test are numerous:
• the early detection of cataract,
• the pre and post operative evaluation in refractive surgery,
• the evaluation of the ability to drive at night.
This test is designed as a color lantern test.
Dots with a defined color are presented to the subject.
Presentation time = 1/25 s ou 1 s
Test distance = 2.5 m (8 ft)
Test size = 1 degree visual angle.