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Visual Acuity Testing for Infants and Children in 30 seconds

Visual Acuity Color Testing for Infants and Children in 90 seconds

 

Dyop® Infant Acuity Test

Dyop® iPad Infant Acuity Test

Adobe Flash format

Adobe SWIFFY format

 

The Dyop® Infant Visual Acuity Screening Test for Infants and Children is a rapid (approximately 30 seconds per color/combination) and simple way to measure the visual acuity for an infant or child (or visual acuity of a non-verbal adult) with a method that directly relates to Dyop® adult visual acuity. 

 

This test can be used on a 22 inch diagonal monitor at a three foot viewing distance or an iPad at a one foot viewing distance.  The appropriate monitor size and viewing distance should provide a sufficient separation between the static and moving Dyop® images on each side of the display to enable tracking the subjects’ head and eye motion.  The typical response of an infant/child is to watch the side of the monitor with the moving Dyop® images rather than the side of the monitor with static images.  Click Start to begin the test.

 

As the location of the moving image alternates from side to side on the monitor, infants and children will change their fixation to instinctively move their head and eyes to focus on the moving Dyop® image.  A mirror may be strategically placed so that an observer holding an infant/child in their lap can use that mirror to better watch the infant/child's eyes and head motion.  With a 19 inch diagonal monitor, the visual acuity endpoint distance is 30 inches feet rather than 3 feet.  With a 15 inch diagonal monitor, the visual acuity endpoint distance is 24 inches feet rather than 3 feet. 

 

NOTE: The tone every four seconds is to provide a secondary auditory stimulation for children.  Adults may find it distracting (or irritating).  Click MUTE or Turn OFF the computer speakers if the SUBJECT finds it distracting.

 

 

Infant Visual Acuity Test – Welcome Screen

(Below is a static screen shots of the test, and NOT the actual test)

 

 

Infant Visual Acuity Test for Black/White-on-Gray Visual Acuity

“20/20” visual acuity has a 36 inch visual acuity endpoint distance

 

Infant Visual Acuity Test Instructions

 

Infant Visual Acuity Test Calibration

For a 19 inch diagonal monitor, “20/20” the visual acuity endpoint distance is 30 inches.

For a 15 inch diagonal monitor, “20/20” the visual acuity endpoint distance is 24 inches.

 

Each part of the test takes about 30 seconds.  Initially have the infant/child sitting at a three foot viewing distance from the monitor.  The infant/child should be able to observe the rotation of the 20 foot 20/20 Dyop® visual acuity endpoint. 

 

Clicking Start for Black/White or Red or Green or Blue test will have the images begin to get incrementally smaller from the 10 to 8 to 6 to 4 foot visual acuity endpoints.  The infant/child should be able to demonstrate that they are tracking the location of the Dyop® rotation by alternately moving their head and eyes from side to side as the location of the rotating Dyop® image changes.  If the infant/child has 20/20 visual acuity, they SHOULD be able to detect the location and rotation of the smallest final 4 foot 20/20 Dyop® at a three foot viewing distance.  The visual acuity endpoint diameters may also be manually validated using the 20, 15, 10, 8, 6, and 4 foot endpoint sizes.  If the images are too small for the subject to detect the rotation, visual problem would be indicated by the infant/child rapidly moving their head and eyes from side to side trying to locate the Dyop® rotation.  This can also be validated by moving the child closer to the monitor to see if the subject can detect the motion of the smeller images. 

 

Repeat the visual screening test for Red, Green, and Blue colored Dyop® images.

 

Visual Acuity in Children

 

You can verify the infant/child’s response by moving them outside of the visual acuity endpoint distance (further away) from the monitor.  The response from a distance outside of the visual acuity endpoint will be for an infant to rapidly move their head and eyes from side to side trying to locate the panel with the Dyop® image rotation.  A verbal child will typically blurt out, “Its disappeared!!!!!

 

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

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