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Alaska Blind Child Discovery

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

Amblyopia Detection by Camera

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Canon TX1
Gateway DV-S20 Photoscreener (center). Kyocera SL300R photoscreen of anisometropia (right). Two Gateway images; horizontal and vertical, of anisometropic amblyopic patient cured of amblyopia with early ABCD detection and compliant amblyopia therapy (above two images).
ADBC Video
Digital cameras manufactured such that the flash is located near the lens produce a bright red reflex in the pupils that can be used to determine risk factors for amblyopia. When a child's eye is not focused on the camera, a light crescent appears in the pupil instead of a uniform dark red color produced by a focused, well-aligned eye. ABCD has purchased several digital cameras with flash-to-lens distance short enough to produce good photoscreening images. These cameras have been calibrated for threshold-levels of amblyogenic unequal farsightedness (hyperopic anisometropia) in a normal young subject (Andrew Arnold) who wore known powered myopic contact lenses to induce known amounts of unequal farsightedness and astigmatism (Alaska Med. September/October 2004;46(3):63-72). An iPhone 4 has the potential to work as a photoscreener.

ABCD has developed a DVD which describes set-up and use of the Gateway DV-S20 as a photoscreener, including examples of normal and positive screened children and two self tests: one with high prescreening probability and one with normal pre-sreening probability. You can purchase the ABCD training DVD by sending $25.00 to ABCD, c/o Ophthalmic Associates, 542 West Second Avenue, Anchorage, Alaska 99501:

Kodiak ADBC success Story
Gateway DV-S20 Set-up Instructions
Current Camera Choices: iPhone Photoscreen  


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