Dyop® - Dynamic Optotype™

Helping the world see clearly, one person at a time




Personal Vision Test

Infant Vision Test

Color Screening Test

Professional Test





Dyslexia Screening




Not everyone sees color in the same way.

Color perception affects your visual skills and personality.






Dyop® Color Screening may be indicative of symptoms of dyslexia, migraines, and epilepsy.


Dyslexia has little to do with (limited) intelligence.  Instead it is typically a symptom of a reduced ability to read letter-based words and an associated difficulty with numbers.  It also seems to be associated with HOW we see colors.


Visual acuity (and accommodation) is regulated by the comparative responses by the cone-shaped Red (L), Green (M), and Blue (S) cone photoreceptors in your eyes.  The cone photoreceptors function as pixelized biological receptors of color much like those of a digital video camera.  The cone photoreceptors also use the focal length disparity between Red and Green to adjust the shape of the lens and bring the overall image into focus (accommodation). 


One of the possible causes of symptoms of dyslexia, migraines, and/or epilepsy is the near vision stress in having a higher ratio of Red to Green photoreceptors (75% red and 20% green photoreceptors).  We call that 75% red and 20% green photoreceptor ratio “Graphic-Based Vision” – (GBV).  That Graphic-Based Vision increases the visual stability of distance images but also increases the instability of the lens when it needs to focus on near images.   That GBV visual dissonance at near distances is associated with dyslexia-type symptoms.  Letter-Based Vision (LBV) (50% red and 45% green photoreceptors) enables a more stable close visual image.


Graphic-Based Vision implies that you see words as pictographs rather than as letter-based combinations.


There are approximately 100 photoreceptors for every optic nerve fiber.  The retina neural ganglia layers “process” those photoreceptor responses in clusters of about 20 photoreceptors as a biological circuit board with the emphasis on patterns of motion and proximity.  Static photoreceptor stimulation tends to be ignored or increase visual strain.  The difference in the perception of color allows the eye to use those colors to create chromatic triangulation to regulate the focal length of the lens.


Photoreceptor Distribution

Vision / Photoreceptor Ratio Type

Red % (L)

Green % (M)

Blue % (S)

Letter-Based Vision (LBV)




Graphic-Based Vision (GBV)





Letter-Based Vision (LBV)

Graphic-Based Vision (GBV)


Retina Structure

Epithelium  =>  4 Neural Ganglia Layers  =>  Photoreceptors


Retina Color Perception














Wavelengths of light


Dyops® create a unique, and previously unavailable, ability to understand and experiment with visual perception.  We have created an experimental Dyop® color/contrast tests whose Graphic-Based Vision response by subjects seems to significantly correlate to symptoms of dyslexia, migraines and epilepsy.

Other related research:


Harris – Colored Contacts Paper


Harris – Colored Contacts Poster


Chromatic Modulation Symptoms


Correlation of Reading Speed to L/M Ratios





Download and print the Color Screening Validation Form to record your data.  Your comments, feedback, and test results would be greatly appreciated.  Please send them to Allan@Dyop.org.



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@Dyop.org

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

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