Team of Pro. Yandan Lin
--Human Factors Lighting & Color Science Laboratory

Eye Movement and Pupil Szie Constriction under Discomfort Glare

Yandan Lin, Steve Fotios, Minchen Wei, Yihong Liu, and Weihong Guo. Eye Movement and Pupil Size Constriction under Discomfort Glare. Investigative Ophthalmology & VisualScience, 56: 1649-1656, 2015


PURPOSE.Involuntary physiological responses offer an alternative means topsychophysical procedures for objectively evaluating discomfort glare. Thisstudy examined eye movement and pupil size responses to glare discomfort usingnew approaches to analysis: relative pupil size and speed of eye movement.

METHODS.Participants evaluated glare discomfort using the standard de Boer rating scaleunder various conditions manipulated to influence glarediscomfort. Eye movement was recorded using an electro-oculogram (EOG), andpupil size was recorded using Tobii glasses. Ten young (mean age: 24.5 yearsold) and 10 senior (mean age: 61 years old) participants were recruited for thisexperiment.

RESULTS.Subjective evaluation of glare discomfort was highly correlated with eyemovement (multiple correlation coefficient [R2]of>0.94, P < 0.001) and pupil constriction (R2 ¼0.38, P < 0.001). Severe glare discomfort increased the speed of eyemovement and caused larger pupil constriction. Larger variations of eyemovement were found among seniors.