The CSV-1OOOE contrast sensitivity chart test face is the most widely used contrast sensitivity test in the world. This test provides for four (4) rows of sine-wave gratings. At the recommended test distance of 8 ft (2.5 meters), these gratings test the spatial frequencies of 3, 6, 12 and 18 cycles/degree. The CSV-1OOOE provides a full contrast sensitivity curve, which is very useful for the evaluation of ocular disease (particularly cataracts, glaucoma, optic neuritis, diabetes and macular degeneration), contact lenses and refractive surgery. For cataract evaluation/documentation, a functional acuity score can be obtained directly from the test scoring sheet.
For those interested in using the CSV-1OOOE in research studies, the test face is available in two versions. The CSV-1OOOE Contrast Sensitivity Chart 1 provides randomized locations for the grating targets.
The CSV-1000RS test face is used widely for screening refractive surgery patients. The test presents ETDRS LogMAR acuity from 20/10 to 20/100 and one row of spatial frequency at 12 cycles/degree.
The patient can be easily screened in the examination chair for ETDRS acuity and contrast sensitivity. If a contrast sensitivity deficit is found, retesting the patient with all four spatial frequencies using the CSV-1000E is recommended.
The CSV-1OOOS test face is widely used for in or out-of-office screenings and for cataract evaluation. This test presents standard visual acuity from 20/15 to 20/200, two rows of spatial frequencies (6 and 12 cycles/degree) and a real-world driver's scene.
The test is very useful for cataract documentation as it provides a standard acuity score, a functional acuity score and a real-world simulation. The real-world scene is an excellent education tool to demonstrate the functional cataract vision loss to both the patients and the relatives of the patients before cataract surgery.
The CSV-lOOOSLanC test face provides the same tests as the standard CSV-1OOOS, except that the acuity test is presented in Landolt C format.
This test is very useful when testing patients who cannot read the English alphabet.
The CSV-1000-1.5CPD is a special test face designed specifically for Food and Drug Administration clinical trials.
At the recommended test distance of 8 feet, the gratings test one spatial frequency of 1.5 cycles/degree.
Contrast sensitivity is very useful in two areas of glaucoma evaluation.
Data now shows that prior to treatment, glaucoma patients exhibit abnormal contrast sensitivity and this abnormality can be used to assess the presence or progression of the disease. Following treatment, 60 to 70% of the patients show clinically significant improvements in CS.
Contrast sensitivity can be used to evaluate the patient response to the initiation of therapy or to a change in therapy.