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Alaska Blind Child Discovery

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

Spectacle Comparison Grading

 
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ABCD has developed a way that two different spectacle refractions can be compared. A 20/20 correctable person can see at least 20/25 with an A-grade match, 20/40 with a B-grade match and 20/80 with a C-grade sphero-cylinder match.    
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