Abstract
The distortion produced by an ophthalmic lens can be quantified by the curvature it generates relative to a straight line (LeGrand, 1956; Fry, 1977; Simonet, Bourdoncle, & Mibge, 1995). These distortions will have a significant impact on functional vision only if their magnitude surpass the minimal change required to produce visual sensations. Therefore, the first point of interest in the present study relates to curvature detection (Tyler, 1973; Wilson, 1985).
© 1998 Optical Society of America
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