AGE VARIATIONS IN NORMAL HUMAN CONTRAST SENSITIVITY

Acta Ophthalmologica - Tập 57 Số 4 - Trang 679-690 - 1979
Gunilla Derefeldt1, Gunnar Lennerstrand1, Björn L. Lundh1
1Department of Ophthalmology (Head: Sven Erik G. Nilson), Linköping University, Sweden

Tóm tắt

The visual contrast sensitivity (the reciprocal of contrast threshold) was studied as a function of age. Psychophysical measurements of binocular and monocular contrast thresholds were made for 33 normal observers at spatial frequencies within the range 0.5 to 40 cycles/degree. The observers were divided into three different age groups: young, middle‐aged, and old subjects with the age ranges 6–10 years, 20–40 years, and 60–70 years, respectively. All observers had healthy eyes, normal vision, and Snellen visual acuity of 1.0 or better in both eyes.In all groups, contrast sensitivity for binocular and monocular viewing peaked at a spatial frequency around 3–5 cycles/degree and showed the typical attenuation at low and high spatial frequencies. The binocular contrast sensitivity was higher than the monocular.There was no significant difference between young and middle‐aged subjects with regard to contrast sensitivity. Subjects aged 60 years or more showed significantly lower contrast sensitivity than younger subjects for most spatial frequencies above 4 cycles/degree. We may thus conclude that both the binocular and monocular contrast sensitivity seemed independent of age within the range of 6 to 40 years. For higher ages studied (above 60 years), there was a loss of sensitivity in the middle and high frequency regions.

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Acta Ophthalmologica

Tập 57 Số 4

679-690

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