Dyop® - Dynamic Optotype™

Helping the world see clearly, one person at a time




Personal Vision

Infant Vision

Color Screening

Professional Use


How it works







Dyop® Gap/Segment Motion



Dyop® Gap/Segment

Photoreceptor Cluster Path

The Dyop® Visual Stimulus Area


21st century visual clarity is measured by the comfort and ability to read text, especially text on an electronic display.  However, vision science has not kept up with the precision and visual demands of 21st century visual needs. 


People who see clearly are typically more productive and able to successfully participate and benefit from 21st century technology.  Seeing “clearly” is not just a problem of images being too blurry, but it also a problem of images being too crisp (overminused).


The strobic response to a spinning Dyop visual target lets you perceive a pixelized response to the images you are seeing to create a more precise measure of visual acuity and refractions


As the spinning Dyop ring diameter gets smaller, or the viewing distance increases, the arc width area of the strobic stimulus of the black/white gap/segments gets smaller and an endpoint is reached where the spinning of the Dyop cannot be detected..  The minimum Dyop angular width diameter where the spinning gap/segment Dyop motion can still be detected is used as the acuity endpoint. 


Static image letter-based vision tests have a tendency for an overminused refraction.  Rather than enhancing visual acuity, static image tests tend to increase visual stress, increase decision fatigue, and create a less precise visual acuity measurement. The use of static letters to measure acuity is more of a test of cognition as it is acuity. 


The sample Dyop images below are calibrated for a 19 inch diagonal monitor and a 10 foot (3.05 meter) viewing distance.


Scaled static images are not as accurate in determining visual clarity as calibrated rotating Dyop® images










































Dyop® angular arc width




The smallest diameter Dyop where spinning can be detected is the acuity endpoint

with a stimulus area of 0.54 arc minutes squared and about 20 photoreceptors.


A  Dyop with a 6.75 mm screen diameter viewed at 10 feet (3.05 meters) has an acuity endpoint of 7.6 arc minutes.









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


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©2019 Dyop® Vision Associates.  All Rights Reserved.