Alaska Blind Child Discovery
A
cooperative, charitable research project to vision screen every preschool
Alaskan
Vision Screen Objective Tests
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ABCD History
Certain ocular conditions predispose the visual system to amblyopia: cataract or media opacity, strabismus and / or high refractive errors. Objective vision screen tests determine if anatomic risk factors for amblyopia are present.
Photoscreeners record reflected red reflex from the retina through the pupils and can estimate refractive error by the magnitude and orientation of a bright crescent.
Remote Autorefractors use invisible energy waves to estimate the refractive error.
Fixation can be detected by birefringence.
Objective tests can be used in infants and toddlers before the age when acuity and other sensory tests can be reliable.
Kids Eye Disorders
Amblyopia
Vision Screening
Issues
ABCD Clinics
References
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