Abstract
Experiments are described in which vernier acuity performance is measured for two subjects using target lines in which the line width, overall contrast and edge-gradient are varied. The results show an optimum line width of about 15 min arc for achieving a best performance. Contrast is shown to be a significant factor in vernier acuity in agreement with other acuity measures. The results also show that edge-gradient is significant in vernier acuity contrary to earlier propositions.
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