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Title: Pupil adaptation Post by: barathvaj on Mar 9, 2012 The pupil gets wider in the dark but narrower in light. When narrow, the diameter is 3 to 5 millimeters. In the dark it will be the same at first, but will approach the maximum distance for a wide pupil 4 to 9 mm. In any human age group there is however considerable variation in maximal pupil size. For example, at the peak age of 15, the dark-adapted pupil can vary from 4 mm to 9 mm with different individuals. After 25 years of age the average pupil size decreases, though not at a steady rate.
Quote After 25 years of age the average pupil size decreases, though not at a steady rate.,Why? Title: Re: Pupil adaptation Post by: caitlinhiemenz on Mar 10, 2012 The pupil starts to SLOWLY decrease after the age of 25 because as you get older, typically your sight gets a little worse with time in most cases. This causes the pupil to get smaller.
Title: Re: Pupil adaptation Post by: barathvaj on Mar 28, 2012 what is the scientific or medical reason behind it ?
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