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Alaska Blind Child Discovery

A cooperative, charitable research project to vision screen every preschool Alaskan

Amblyopia Detection by Acuity Tests


Internet Acuity Test-LAPSED


Amblyopia is the main disease we seek to detect with pediatric vision screening. Detecting simple refractive errors such as myopia and astigmatism is a secondary goal of vision screening, particularly in school-aged children. Amblyopia is less-than-normal brain vision and therefore is one cause of decreased central acuity.

Acuity tests have long been the mainstay of childhood vision screening. When a child is old enough to cooperate, visual acuity is determined by the smallest subtended angle of a figure, letter or image (optotype) that can correctly be identified most of the time. In the past, Tumbling E or adult Snellen (Sloan) charts were used. Some validated contemporary pediatric Acuity tests are LEA™ Figures and HOTV letters. ABCD has developed a bilaterally symmetric, Surrounded Enhancement called HOTVAX requiring only 2 of three guesses to confirm the passing line.

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HOTVAX Powerpoint:
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Importance of Patched Acuity Test:

Acuity Test Issues
    PDI Check    
Internet ""
Precision Vision
Vision Assessment
Home Acuity Test Download
HOTVAX Rapid Acuity
Home Acuity Monitor Kit
Amblyopia Foundation of America Computer HOTV
Vision Quest 20/20™


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