Contrast Sensitivity in Army Aviator Candidates: Cycloplegia Effects and Population Norms
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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This study was designed to provide information regarding three aspects of contrast sensitivity testing aviator candidates 1. To determine whether contrast sensitivity functions CSFs obtained with the VISTECH Visual Contrast Test System VCTs are affected by ocular cycloplegia 2. Since Army aviator candidates differ from the general population by being more highly selected with respect to visual and refractive status, more homogenous in age and in an age bracket when vision is optimal, a second purpose was to obtain a large normative sample of CSFs for establishing future contrast sensitivity standards for this population and 3. To determine whether the VCTS provides useful CSFs under clinical screening conditions in a timely and simple manner. Contrast sensitivity thresholds were obtained at 5 spatial frequencies from 106 aviator candidates, prior to and following the administration of a cycloplegic. Contrast sensitivity functions obtained under cycloplegia were reduced about 20 percent. The CSFs of the aviator candidates are much superior than the general population norms. The VCTS provides useful CSFs under military screening conditions.
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