Effect of the interposition of optical filters with different visible light transmittances in mesopic and scotopic condition pupil size.

Abstract

Purpose:To determine how can the pupil size, in mesopic and scotopic condition, be afected by the interposition of optical flters. Also, the variability of the efect of these optical filters due to each filter’s diferent visible light transmittance. Methods :The transversal study included data from 56 eyes of 28 subjects. To measure the diferent pupil size, in high mesopic, low mesopic and scotopic condition, was used a digital binocular infrared pupillometer. The obtained pupil size’s measurements, without filter, were compared with the results after the insertion of the diferent optical filters used: 16 flters with diferent transmittances (from 82% to 5%). Results: Some flters, 5 of the 16, with diferent transmittances, 63%, 17%, 8%, 6% and 5%, caused significant variations in the pupil size in mean mesopic condition. The 2 highest transmittance’s filters, 63% and 17%, between these 5 filters, which produced significant results (p<0.00, high mesopic condition, 4.0lux), were the ones that led a higgest pupil size variation, in the 3 diferent light conditions. Conclusion: The influence of some optical filters in pupil size variation, was confirmed. This efect on pupil size was significant only in high mesopic condition, and it was independent of each filter’s diferent visible light transmittance