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


Visual clarity in the 21st century 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 consistently see more clearly are typically more productive and able to successfully participate and benefit from 21st century technology.  Seeing “clearly” is not only 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 diameter gets smaller, or the viewing distance gets larger, the strobic stimulus of the black/white gap/segments gets smaller.  That minimum angular arc width of the Dyop diameter and area of the gap/segment stimulus where you still detect the spinning Dyop motion can be used as the acuity endpoint. 


Because of the tendency of an overminused refraction, rather than enhancing visual acuity, static image letter 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.






When the Dyop gap/segment stimulus size is too small, or the viewing distance is too far away, you cannot detect the spinning of the pixelized Dyop® gap/segments.  That minimum Dyop diameter and gap/segment stimulus where you CAN detect the Dyop® spinning is the acuity endpoint.


The 1862 “standard” for acuity uses a letter-based test to detect perception of the differences between static letters such as “E” and “C.”  However, the use of static letters is as much a test of cognition as it is acuity.  Static letter tests, rather than enhancing visual acuity, increase visual stress, increase decision fatigue, and create a less precise visual acuity measurement.


The Dyop motion detection process increases accommodative rest, takes the guesswork and visual stress out of vision testing, and increases the efficiency of the visual testing process.  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.




 “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©2017 Dyop® Vision Associates.  All Rights Reserved.