Effect of pupil size on kinetic visual field measurements

Abstract

We determined visual field size as a function of pupil size by repeated measurements of Goldmann fields with an I2 target in the same subjects using contact lenses with different sized artificial pupils. Increasing pupil size from 3 to 6.8 mm increases visual field size from 2.79 to 3.34 steradians, an average increase of 19.7 per cent; a control experiment suggested that the major part of this effect can be explained by reduction of retinal illuminance produced by the variation in pupil size.