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The Mars Letter Contrast Sensitivity Test

News The Mars test goes global! We are proud to announce that the test is now in use in over 30 countries throughout the world! The Mars test has been selected for inclusion in the American Academy of Ophthalmology's Preferred Practice Pattern entitled Vision Rehabilitation for Adults. Three very positive evaluations of the Mars test have been published in the scientific literature, all in highly prestigious journals. All are available on the downloads page. A set of approximate norms for use with the test is now available for download here. Article describing the design of the Mars test published in Investigative Ophthalmology & Visual Science. Read it here.

The Mars Letter Contrast Sensitivity Test, the most accurate and convenient contrast sensitivity test available, is now being sold direct to ophthalmologists, optometrists, eye clinics and vision researchers.

Unlike many other contrast tests that merely assess visual acuity using low contrast targets, the Mars test is a true contrast sensitivity measure that indicates the lowest contrasts your patients can perceive, rather than the smallest letters they can identify at some low, arbitrarily chosen contrast. With the Mars test, it is the contrast, and not the letter size, which diminishes from the beginning to the end of the chart.

The letters are large, insuring that most patients, even those with low vision, can see them. And because research has consistently shown that large letters are identified by the most sensitive of the visual system's size-tuned spatial frequency channels, the Mars test accordingly yields the sensitivity of the most sensitive channel, and of the visual system as a whole.

Uses

• Establishing baseline contrast sensitivity prior to and after an intervention (such as cataract extraction, LASIK, or other refractive surgery)
• Identifying functional losses in low contrast perception (often associated with glare sensitivity)
• Monitoring effects of disease progression on function
• Clinical trials
• Patient education

Features and Benefits

• Three charts, for the left eye, right eye and binocular testing, or for repeated testing without letter sequence memorization
• Rapid administration, with easy, accurate scoring
• Easy to store and protect
• Easy to illuminate (e.g., with instrument stand lamp)
• Each chart mounted on durable plastic
• Designed for near testing (40 or 50 cm)
• Low cost

The test of choice for clinicians and researchers alike!

Order here!