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Reliability of the Cambridge Low Contrast Gratings
Author(s) -
Jones Helen S.,
Moseley Merrick J.,
Thompson John R.
Publication year - 1994
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1994.tb00009.x
Subject(s) - contrast (vision) , reliability (semiconductor) , optometry , computer science , optics , psychology , physics , medicine , artificial intelligence , power (physics) , quantum mechanics
We examined the reliability of the Cambridge Low Contrast Gratings over four sessions at intervals of 1 hour, 1 day and 1 week. The 95% ranges of difference scores were found to be ± 10.3 and ± 10.5 test units, for left and right eyes respectively. These reliability estimates span almost one‐quarter of the test's dynamic range and one‐third of the subjects' performance range. Practice effects were not found to be significant. Though previous reports have emphasized the usefulness, of the Cambridge Gratings in screening for eye disease, caution is advised when interpreting changes that occur over time.