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Influence of surround illumination on pupil size and contrast sensitivity
Author(s) -
Vizmanos Juan G.,
De La Fuente Isabel,
Matesanz Beatriz M.,
Aparicio Juan A.
Publication year - 2004
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2004.00230.x
Subject(s) - luminance , contrast (vision) , pupil , pupil size , optics , sensitivity (control systems) , physics , electronic engineering , engineering
Lighting plays a major role in contrast sensitivity (CS) measurements. Both the test and surround illumination influence the results although they are not usually considered in clinical practice. The effects of test luminance are well known, but the influence of surround luminance seems to be less investigated. This study aims to evaluate the differences in CS measured with two configurations of surround illumination typical of clinical practice; and to analyse the influence of the angular size of the target on pupil diameter for both surround luminances. An experimental arrangement was designed to measure CS with controlled illumination of both test and surround. An infrared pupillometer was also used to measure steady pupil size. A statistically significant increase of CS and a decrease of pupil size with higher surround illumination were found.