Dyop Color Vision Test Explanation

			Dyop® - Dynamic Optotype™ Helping the world see clearly, one person at a time.
Home	Personal Vision	Children’s Vision		Color Screening	Professional Use	Links
How it works	Experimental Dyop Test	Visual Impairment		Dyslexia Screening	Using the Test	Induced Dyslexia

You see in Color - NOT just in Black and White.

Dyop® Vision Test

FREE Dyop Color Screening Test

FREE Dyop Online Color Screening Test

Color Acuity screening may be indicative of symptoms of dyslexia, migraines, and epilepsy.

For Dyop® Color Screening select the COMPUTER version of the test. Move away feet from the identical-diameter rotating color/contrast Dyop® images until you CAN ONLY detect either the rotating Green-on-White Dyop® OR the Blue-on-Black Dyop®. You can also use the Down Arrows to make the images smaller. For valid color perception screening, the test should be taken without wearing your glasses or corrective lenses.

For a Tablet or SmartPhone, select the appropriate device from the links above, and then move away from the rotating color/contrast Dyop® images until you CAN ONLY detect either the rotating Green-on-White Dyop® OR the Blue-on-Black Dyop®. For valid color perception, the test should be taken without wearing your glasses or corrective lenses.

If you can detect only the rotating Green you have Letter-based Stable Near Image (SNI). If you can detect only the rotating Blue you have Graphic Near Vision Stress (NVS). Graphic implies that you see words as pictographs rather than as letter-based combinations.)

You may also use the colored animated GIF files on this webpage (below) by moving towards the images and noting when they get sufficiently small as to whether you CAN ONLY detect either the Green-on-White Dyop® OR the Blue-on-Black Dyop®

The 8 Dyop® color images below are for use on a Smart Phone




Blue	Black/White	Green

The Dyop® images below are for a 10 foot Viewing Distance when the line is 10 inches long

|-------------------------------------------------------------------------------------------------------------------------------------------------------------|




Green	Black/White	Blue

IN THEORY, individuals with chromatic dyslexia-type symptoms have Graphic Red-Focused Vision (RFV) and have an excess ratio of L (red) photoreceptors in their eyes. The excess of red photoreceptors induces visual dissonance when reading, thus the symptoms are associated with “slow reading.”

Photoreceptor Distribution

Vision / Photoreceptor Ratio Type	Red % (L)	Green % (M)	Blue % (S)
Stable Near Image (SNI)	50	45	5
Near Vision Stress (NVS)	75	20	5

Your comments, feedback, and test results would be greatly appreciated. Please send them to Allan@DyopVision.org.

Note: Dyop® tests are for vision screening purposes only and are NOT a substitute for an examination by a licensed vision care professional.

The Dyop® (Dynamic Optotype™) tests and concept are covered under U.S. Patent US 8,083,353

and International Published Patent WO 2011/022428.

For further information contact: Allan Hytowitz at Allan@DyopVision.com

5035 Morton Ferry Circle, Alpharetta, GA, 30022 / 678-893-0580