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Assessment of Visual Functions in Three Different Illuminations

Shaijan Mathew, Blessy Xavier, Aparna S, Anitha Arvind

Illumination level alters visual perception and performance. The visual system is constantly exposed to different levels of illumination ranging from photopic to scotopic levels. Age and ocular condition also contributes to visual performance hence it was important to assess the visual functions in different age groups under different levels of illumination. 30 participants were selected based on inclusion criteria of the study. Subjects were divided into three groups: Group 1: 18-28 years, Group 2: 29-38 years and Group 3: 39 years and above. The study was conducted in a room whose illumination was adjusted by a rheostat to provide three different levels of illuminations 10 lux (scotopic), 100 lux (mesopic) and 400 lux (photopic). Visual function tests such as visual acuity, contrast sensitivity, colour vision, stereopsis, and modified Thorrington test, accommodative facility and vergence facility were evaluated under each levels of illumination for every age group.