Age and sex differences in critical flicker frequency.

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Abstract
In order to study the in-fluence of sex and age on critical flicker frequency (c.f .f.), the latter was determined for 50 subjects from 19-30 yrs. of age, and 50 from 63 to 87 yrs. of age, with the sexes equally represented in both age groups. The flicker was produced by a 3-watt neon glow lamp of an electronic apparatus, for the first time used in this type of research, showing advantages over other methods. A significant difference in the c.f.f. between young and old age was found, the avg. monocular c.f.f. for the young group being about 43 and the old 35 cycles/sec. No sex differences were found. The findings held true whether c.f.f. was detd. when both eyes were used, or one eye, either dominant or non-dominant. Since there is a strong indication that the decrease in c.f.f. in the old age is due to the atrophic changes in the optic nerve and the C.N.S., the c.f.f. can be a useful measure in gerontologic studies.

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