Visual acuity --- the ability to see objects in sharp detail --- was evaluated in 1,504 children aged 30 to 71 months as part of the Baltimore Pediatric Eye Disease Study, the first large, population-based study of eye disorders in preschool children. Researchers found that FPT --- considered the "clinical standard" for testing vision in preverbal children and the only test widely available to eye specialists for this age group --- did not accurately identify the presence or absence of visual acuity problems in this study population.

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