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CONTRAST SENSITIVITY IN VISUALLY IMPAIRED CHILDREN
Author(s) -
HYVÄRINEN LEA
Publication year - 1983
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1983.tb03932.x
Subject(s) - contrast (vision) , spatial frequency , sensitivity (control systems) , visual acuity , retinitis pigmentosa , optometry , blind spot , audiology , vision test , medicine , ophthalmology , optics , retinal , physics , electronic engineering , engineering
Spatial contrast sensitivity may decrease differently at different spatial frequencies when vision is impaired. Patients with central scotoma may have normal or decreased sensitivity at low spatial frequencies, their Snellen acuity often is lower than grating acuity estimated on the basis of contrast sensitivity values. In retinitis pigmentosa contrast sensitivity may decrease at the low spatial frequencies already in the early teens. Because the ability to discern low contrasts is important in daily living, spatial contrast sensitivity measurements should become a part of clinical evaluation of vision.