Dyop® - Dynamic Optotype™

Helping the world see clearly, one person at a time




Personal Vision

Infant Vision

Color Screening

Professional Use


How it works

Using the Test

Visual Impairment

How it works

Using the Test




We see the world as pixels before we see it as lines and shapes.


Our eyes function as biological machines, much like a digital video camera.  The images we see are initially pixels rather than lines or shapes.  The photoreceptors of our eyes respond to light much like the pixel in a camera.  The neurons of the retina convert the pixel stimulus of about 100 photoreceptors and merge them into the stimulus of one optic nerve fiber before transmitting that impulse to the brain.  The brain takes the optic nerve stimulus and gives us the illusion of lines and shapes.


As light is transmitted and focused by a properly functioning biological lens, it also separated into wavelengths of color.  That “rainbow” effect typically has the color red focused slightly behind the retina, the color green typically focused on the retina, and the color blue in front of the retina.  The disparity of the focal intensity of red/green/blue is transmitted to the muscles controlling the shape of the biological lens, which in-turn regulates the instantaneous adjustment of the lens focal length know as accommodation.



Light passes through the lens to reach the retina


Retina Structure

Epithelium  =>  4 Neural Ganglia Layers  =>  Photoreceptors


   Retina Color Perception

Wavelengths of light





















A Dyop® (short for dynamic optotype) is a visual stimulus which is a rotating segmented strobic gap/segment utilizes the photoreceptor pixel perception to measure visual acuity.  The strobic stimulus of the moving black/white-on-gray Dyop® gap/segments serves as a on/off switch for photoreceptor stimulus.  Much as the lines and shapes we see on a pixelized TV, or other electronic display, we see the lines and shapes when we no longer perceive them as pixels.  As the stimulus area of the gap/segment area gets too small, that stimulus becomes smaller than the minimum area of photoreceptor visual resolution.  The minimum stimulus area which lets us see the Dyop® gap/segment motion as a pixel-type stimulus is the acuity endpoint and provides a very precise, accurate, and efficient method for determining visual acuity.


As people are able to consistently see more clearly, their ability to be productive and successfully participate and benefit from 21st century technology significant increases.


Dyop® vision tests are more accurate than static image tests, more precise, more consistent, potentially faster to use, and do not require the ability to read, let alone the ability to read English.  Centuries ago, visual clarity was defined by the ability to see the nighttime gap between two of the smaller stars in the handle of the Big Dipper constellation.  Current visual clarity “standards” use the 1862 ability to detect differences between static letters such as “E” and “C.”  However, using letters frequently mistakes cognition for clarity, is culturally and literacy biased, is significantly imprecise and inconsistent, and doesn’t sufficiently meet the needs of 21st century technology in measuring visual clarity.


 “Any sufficiently advanced technology is indistinguishable from magic.”
- Arthur C. Clarke’s Third Law


























1862 Vision Testing

21st Century Vision Testing



Static letters, rather than enhancing visual clarity, increases visual stress, increases decision fatigue, and creates a less precise visual clarity measurement.  The Dyop® motion detection process increases accommodative rest, and lets the Dyop® test take the guesswork and visual stress out of vision testing, and potentially increase the efficiency of the visual clarity testing process.  Our eyes developed as sensors for detecting motion, distance, and colors so that humans could better detect predators and game, and eat rather than be eaten.  Dyop® tests use that visual preference for motion detection of the moving gap/segment area to determine your clarity endpoint. 


Calibrated Dyop® tests are intended as a global replacement for Snellen, Sloan, and Landolt optotypes.



As a culture we are only as good as our memory.  As a species we are only as good as our vision.


Just as the hand, held before the eye, can hide the tallest mountain, so the routine of everyday life can keep us from seeing the vast radiance and the secret wonders that fill the earth.

-          Chasidic, 18th Century




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

Copyright©2016 Dyop® Vision Associates.  All Rights Reserved.




Return to top