Contrast Sensitivity Experts
LOW CONTRAST ACUITY TESTS
CSV- lOOOETDRS 10%
The CSV-lOOOETDRS10% test face presents the standard ETDRS test at a contrast level of 10%. This test is widely used in clinical studies for the evaluation of refractive surgery and contact lenses.
CSV-lOOOLanC10%
The CSV- lOOOLanC 10% test face is a LogMAR acuity test which uses the Landolt C in various orientations for the test targets. The targets are presented at 10% contrast. The test is very useful for evaluating the low contrast acuity of illiterate or non-English speaking patients.
CSV- lOOOCVA20/30
The CSV-lOOOCVA20/30 test face provides three contrast levels (high, 9.5 % and 6%) of LogMAR acuity from 20/16 to 20/100. This test is designed to detect very subtle changes in vision, such as associated with contact lens evaluation or due to refractive surgery. The upper two rows of the test provide the same contrast and acuity levels as the lower two rows; different groups of letters are used in these sections so that each section can be used to test the different eyes.
Patients should have 20/30 or better vision to be evaluated with this test face. If patient vision is worse than 20/30 visual acuity, use of the CSV-lOOOETDRS 10% is recommended for testing.
Diabetes is a systemic disease which damages blood vessels in the eye and, if unabated, can cause blindness.
New data is now available which suggests that vision loss related to early vascular damage in the eyes of diabetic patients can be detected by contrast sensitivity evaluation.
The VectorVision CSV-1000 is the most widely used test in the world for standardized contrast sensitivity, glare sensitivity and ETDRS testing.
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