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Alaska Blind Child Discovery

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

Photoscreen Validation Grid


Screening aims to apply a simple test to determine whether a patient has a health condition- like Amblyopia. Whether a screening test is helpful can be determined by 10-points published by the World Health Organization- but also whether the screening test is VALID.

ABCD has developed an Excel spread sheet with a 3x3 contingency table to help calculate validation statistics like SENSITIVITY and SPECIFICITY including whether the screening test was INCONCLUSIVE or whether any of the screened individuals were LOST-TO-FOLLOWUP. 2/2015

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  Introduction to Validation    


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