Measuring contrast sensitivity with inappropriate optical correction

Spatial frequency-selective minima (notches) in the contrast sensitivity function (CSF) because of defocus can mimic those that occur with ocular disease. We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of de...

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Veröffentlicht in:Ophthalmic & physiological optics 2000-11, Vol.20 (6), p.442-451
Hauptverfasser: Woods, Russell L., Strang, Niall C., Atchison, David A.
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creator Woods, Russell L.
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Atchison, David A.
description Spatial frequency-selective minima (notches) in the contrast sensitivity function (CSF) because of defocus can mimic those that occur with ocular disease. We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of defocus for all subjects. Multiple notches were found under some conditions. Notches were found with defocus as small as 0.50D. Effects of induced astigmatism depended on the orientation of the target. Notches were apparent in defocus conditions after stimulus size and room illuminance were modified and when subjects had insufficient accommodation to compensate for hypermetropic defocus. The equivalent of notches was not noted with the Pelli–Robson chart. As defocus-induced CSF notches may be mistaken for functional loss, careful refractive correction should be conducted prior to clinical or experimental CSF measurement, even at low spatial frequencies.
doi_str_mv 10.1016/S0275-5408(99)00089-7
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subjects Adult
Aged
Biological and medical sciences
Contrast Sensitivity - physiology
Humans
Investigative techniques of ocular function and vision
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Middle Aged
Optics and Photonics
Vision Disorders - diagnosis
Vision Disorders - prevention & control
Visual Acuity - physiology
title Measuring contrast sensitivity with inappropriate optical correction
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