Dyop® - Dynamic Optotype™

Helping the world see clearly, one person at a time




Personal Vision

Infant Vision

Color Screening

Professional Use



Using the Test






The Dyop® test takes the guesswork out of visual clarity


Dyop® Basic Visual Clarity Test

Adobe Flash format

Dyop® Concept Summary

Adobe Acrobat format


iPad/Tablet Dyop® Acuity Test


SmartPhone Dyop® Acuity Test

Adobe SWIFFY format


Adobe SWIFFY format

Dyop® Patient Brochure


Dyop® Professional Visual Clarity Test

Adobe Acrobat document


Adobe format



The Dyop® Basic Visual Clarity Test (link above) is intended to be viewed 10 feet from your monitor, and to give you a precise indication of your visual clarity.  Selecting the correct monitor size and viewing distance insures that the images are properly calibrated.


To use the Dyop® Basic Visual Clarity Test, open the link for the test, fill in the value of your viewing distance from the Monitor, and calibrate the monitor size using the “Calibration Credit Card” image.  Click the Dyop® logo to begin the test.  Sit or stand the desired distance from your monitor and observe the motion of the initial Dyop® images.  (See screen shots below).  Use the mouse scroll wheel or the Up/Down screen arrows to reduce the diameter of the Dyop® imaged to determine the arc width of the smallest Dyop® that can clearly be detected as rotating.  That arc width is an indicator of your visual clarity endpoint.


Since we actually see in Red, Green, and Blue rather than just Black/White, you can also check your clarity in color.


The images below are static screen shots of the test, and NOT the actual test.


Welcome Screen

Calibration Screen – Viewing Distance and Monitor Size

Click the Dyop® logo to start the test

Initial Dyop® Arc Width 19.2 – Snellen 20/102

Blank the controls with the Space Bar

Dyop® Arc Width 57.2 arc minutes – Snellen 20/702

Dyop® Arc Width 11.3 arc minutes – Snellen 20/40

Dyop® ColorMatrix™ color/contrast options

Red/Green Color Balance

Color Group Screening


Your visual clarity may not be the same for each eye (and differs for clarity in color).  Check clarity first with BOTH EYES and then EACH EYE individually.  Your visual clarity endpoint is the arc width diameter of the Dyop® image at the correct viewing distance.  A 7.6 arc minute visual acuity endpoint is equivalent to the Snellen 20/20 ratio.


Example: If your viewing distance is 10 feet from the Dyop® image, and the smallest Dyop® image you can detect rotating without using your glasses has a 15.2 arc minute width (13.5 diameter wide) then your visual clarity is similar to the Snellen ratio of 20/40.


Note: Dyop® tests are for vision screening purposes only and are NOT a substitute for an examination by a licensed vision care professional.  The computerized Dyop® tests use Adobe Flash and may be viewed virtually any computer using Google Chrome or Internet Explorer (with ActiveX enabled) or Firefox or Safari or other graphics viewers such as Irfanview with the Flash Graphic plug-ins and the free Adobe Flash Graphic Viewer enabled.  To use the Dyop® tests on a Tablet/SmartPhone, such as an iPad or iPhone, you need to use the Adobe Flash SWIFFY HTML Dyop® test versions, however, the SWIFFY HTML tests will NOT properly display with older versions of Internet Explorer.


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 DyopVision™ Associates.  All Rights Reserved..