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Visual contrast sensitivity (VCS) testing to individuals who suffer or suspect they may suffer from a health condition that affects contrast sensitivity . Visual contrast sensitivity testing measures your ability to see details at low contrast levels and is often used as a nonspecific test of neurological function. Similar in form to a standard audiometry hearing test, a VCS test generally involves the presentation of a series of images of decreasing contrast to the test subject and the recording of the contrast levels where patterns, shapes, or objects can or cannot be identified. The results of the test can then be used as an aid in the diagnosis of visual system dysfunction. Many things can affect the ability to perceive contrast. These include nutritional deficiencies, the consumption of alcohol, drug/medication use, a certain species of mold and the mycotoxins and microbial VOCs they produce, parasites, heavy metals like mercury and lead, and the pathogens responsible for Lyme disease and its common co-infections.
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