Sensitivity to blur detection varies among optometric patients, suggesting important clinical implications.
Sensitivity to blur detection was measured for 30 optometric patients by having them match the clarity (or blur) of the target words at the test endpoint with 1 of an identical set of photographically defocused words. The group showed considerable variance in their blur scores which approached a normal distribution. Some clinical implications are discussed.
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Layton et al. (1978) studied this question.
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