VCS

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Did you know? VCS deficits caused by neurotoxins are not due to

optical (lens, cornia) problems that can be corrected by glasses.

They are caused by neurotoxin-induced alterations in neurologic

function.

Functional Acuity Contrast Test F.A.C.T®, Stereo Optical Co., Inc.,

Chicago, IL.US Patent #s: 4,365,873 & 5,414,479.

The Near Vision F.A.C.T. 101 is the system used clinically and in

research to measure visual contrast sensitivity (VCS).

$275.00 + $10.00 UPS S/H($20.00US for shipments outside the

continental US)

A $25.00 discount is available to physicians and researchers who

agree to collaborate on research studies (Email the webmaster with

your request and credentials).

The system includes:

- One Near Chart card with a holder calibrated to keep the card at

the appropriate distance from the eyes (18 " ).

- The high photographic quality card contains a 5 row by 9 column

matrix of stimuli. The stimuli are sinusoidal gratings (dark and

light bars) which decrease in contrast in 0.15 log unit steps from

left to right. The spatial frequency (bar size) progresses in one

octave steps (i.e., a factor of two) from the top row, A, to the

fourth row, D, and then in a ½ octave step to the bottom row, E.

- The spatial frequencies are 1.5, 3, 6, 12, and 18 cycles per

degree of visual arc at the viewing distance of 18 " .

- The F.A.C.T. accurately measures VCS under normal office lighting

conditions (20-70 foot lamberts or 68-240 cd/m2).

- Also included are an instruction manual, record forms, and a 2

color pen (use one color to record left eye data and the other for

right eye data).

This is on the www.chronicneurotoxins.com. My Enviro doc didn't

test each eye separately. Might try that next time. Rhonda