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Dyop® - Dynamic Optotype™ Helping the world see clearly, one
person at a time |
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Visual
Acuity Testing for Infants and Children in 40 seconds or less
Color Visual Acuity Testing
for Infants and Children in 120 seconds or less
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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
spinning Dyop® rings 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 spinning Dyop® ring rather than the side of
the monitor with static Dyop®
ring. Click Start to begin the test.
As the location of the spinning Dyop® ring 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 spinning Dyop® ring. 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. Each part of the
test takes about 30 seconds. Initially
have the
infant/child should be sitting at a three foot viewing distance from the
monitor. The infant/child should be
able to observe the spinning 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 Dyop® rings 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 spinning Dyop® by
alternately moving their head and eyes from side to side as the location of
the spinning Dyop® ring changes. If the infant/child
has 20/20 visual acuity, they SHOULD
be able to detect the location and spinning of the smallest (and 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 rings are too small for the subject
to detect the spinning, visual problem would be indicated by the infant/child
rapidly moving their head and eyes from side to side trying to locate the
spinning Dyop®. This can also be validated by moving the
child closer to the monitor to see if the subject can detect the spinning of
the smaller Dyop® rings. Repeat the visual screening test for Red, Green, Yellow,
and Blue colored Dyop® rings. 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 side of the panel with
the spinning Dyop® rings. A verbal child will typically blurt out,
“It’s disappeared!!!!! Note: Dyop®
tests are for vision screening
purposes only and
are NOT a
substitute for an examination by a licensed vision care |
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 / 404-281-7798
Copyright©2020 DyopVision™ Associates. All Rights Reserved.