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Conferences > OAM > 1993 > ThGG > ThGG.1

Important clinical and functional differences between grating-contrast sensitivity and low-contrast letter acuity

Arthur P. Ginsburg

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Abstract

Contrast thresholds for sine-wave gratings (SWG) using VDT and chart (Ginsburg), Snellen charts and low contrast letter (LCL) charts (Pelli–Robson and Regan) are compared: to measure clinically and functionally meaningful ranges of spatial frequencies or sizes and contrast; absolute and differential contrast sensitivity; and relationship to clinical and functional vision. When these data are plotted on the same contrast sensitivity versus spatial frequency graphs important differences between the SWG and LCL are revealed.

© 1993 Optical Society of America

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