The purpose of this project was to gather normative data on the performance of schoolchildren in grades one and four on the accommodative, prism, and distance rock tests. Since these tests are commonly used as screening devices to assist in diagnosing the asthenopic child, this data can be utilized when assessing and comparing a chiId's performance. Another important purpose in the design of this study was to develop targets for accommodation and prism rock testing that would reduce confounding variables inherent to previously used targets. This study used modified "Landolt C" targets. As a result, the data has shown that there is a very active transition period of maturity and visual skill level occurring between the first and fourth grade. Clinically, these tests may be utilized to measure the maturational progress of these visual subskills enabling the clinician to make a more accurate diagnosis. The validity of directly applying normative data derived from adult popu·1ations to young children should be avoided.
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