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Measurement of glare sensitivity in cataract patients using low‐contrast letter charts *
Author(s) -
Regan D.,
Giaschi D. E.,
Fresco B. B.
Publication year - 1993
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.1475-1313.1993.tb00439.x
Subject(s) - glare , contrast (vision) , optometry , cataracts , visual acuity , ophthalmology , chart , medicine , vision test , test (biology) , audiology , computer science , artificial intelligence , mathematics , materials science , paleontology , statistics , layer (electronics) , biology , composite material
The Committee on Ophthalmic Procedures Assessment of the American Academy of Ophthalmology suggested using low‐contrast visual acuity measured before and after adding a glare source as a test for assessing overall visual disability from immature cataracts. We have developed a test that follows the Committee's three principles of design, and we report that the effect of glare on visual acuity is considerably greater for recognizing low‐contrast letters than for recognizing high‐contrast letters. The effect of glare on visual acuity increases progressively as letter contrast is reduced in the stages 96%, 50%, 25%, 11% and 4%, The 25% chart (and possibly the 11% chart) gives the most suitable sensitivity for eyes with immature cataracts. Age‐related brunescence and aging itself do not necessarily produce high sensitivity to glare. Sensitivity to glare was markedly different in eyes with different kinds of cataract.