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How the VCS Test Works
The visual system includes a complex neurological network that involves
the retina, optic nerve, brain nuclei and the visual cortex. One of the
main outputs of the visual system is pattern vision. The VCS tests is
an indicator of ability to detect visual patterns. The test measures the
least amount of contrast between light and dark bars (sinusoidal grating)
that is needed for the viewer to detect the bars. VCS is measured at five
different bar sizes (spatial frequencies) because perception of different
bar sizes is mediated by different physiological components, and these
components are differentially susceptible to effects from different toxic
substances (10-17). The largest effects of biotoxins are at the mid-size
bars (1-8). To measure VCS, viewers are presented a series of bar patterns
at each of the five bar sizes. Viewers respond by indicating that the
bars are tilted to the left, tilted to the right, are straight up and
down, or that they cannot see any bars. The pattern with the lowest contrast
that is correctly identified is the measure of VCS for that bar size.
Upon completing the VCS test, viewers receive a message indicating that
biotoxins are (positive) or are not (negative) likely to be involved in
their illness. The criteria for getting a "positive" VCS result
is set high to avoid false positive results. This occasionally results
in a false negative result; some cases of chronic-biotoxin induced illness
may pass the VCS test a some times. VCS can be measured during treatment
to monitor recovery.
No guarantees for a cure for any disease are implicitly or explicitly
given to anyone. No single vision test can fully describe function of
the visual system or conclusively indicate the presence or absence of
neurotoxins or neurotoxicity. Diagnoses cannot be made and medications
cannot be prescribed without seeing a physician in person.