Show Pupils Eye-Pupils Con Con- Contract Contract tract With Age The pupil of the eye is 15 the door door- doorway doorway doorway way of or light Everyone knows that the aperture aperture- or shutter of a cam camern camera camera era ern controls control the brightness brig of the ame 19 orA the film Similarly the I size of the pupil controls the bright brightness brightness brightness I ness of the Imag imago image on the retina rehna or orI I camera film of the e eye eve e As eyes grow old the pupil becomes smaller f any 11 given en condition thereby admitting less light to the retina On this basis alone old persons need at least twice as I much light as young and ind middle aged ged persons do Considering also that then therm eye eyes have become dulled I by years of use and old pi sons se cral times as much I lIght n as 3 soung oung people J |