Threshold and Rate of Dark Adaptation as Functions of Aǵe and Time

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In order to describe one family of dark adaptation curves obtained from an age sample ranging from 16 through 89 years, a mathematical model of the form [Formula: see text] was derived. It was found that the model could be generalized. In addition it was concluded that threshold of dark adaptation as a function of time was lawfully related to chronological age. Rate of adaptation was determined by differentiating the equation at time 30 sec and time 6 min as follows: [Formula: see text] The results showed that rate of dark adaptation was a curvilinear function of age. These findings are consistent with the hypotheses that dark adaptation threshold and rate of dark adaptation depend upon basic underlying physiological processes that change with age.