There has been an abundance of data collected on the high prevalence of visual anomalies in mentally impaired children. Sensitive periods in visual binocular development mandate the need for early visual assessment and intervention. This study assessed three visual acuity tests used with this population: the Broken Wheel acuity test, the Lighthouse acuity test and the Acuity Card Procedure (ACP). Twenty-four children aged 18 months to 8 years old were tested. For 100% of the children the ACP was successfully administered. Measuring acuities is an important step in establishing visual performance records and evaluating visual remediation strategies in children with visual dysfunction. It appears that the ACP is a useful test in evaluating children often thought untestable.
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