Abstract | Although there are a variety of reasons why a person might complain about seeing in the work environment, it is possible that his own visual capacity has created or exacerbated a problem. At present, there are no practical and meaningful field tests available for diagnosing potential problems in visual capacity. Although incomplete as a diagnostic tool for visual performance and ocular health, visual acuity is a sensitive measure of a person's visual potential. This report documents a large population study of near-field visual acuity as well as a simple empirical model for predicting visual acuity for different target contrasts and observer ages under two illumination levels. A simple field testing procedure, based upon the population acuity data, is also discussed. For application specialists concerned with complaints about seeing in the work environment, this procedure can be a useful tool for diagnosing the source of those complaints. |
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