AGE VARIATIONS IN NORMAL HUMAN CONTRAST SENSITIVITY

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.

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