Iris Color and Visual Function

Abstract

Objective: To find out which type of iris colors significantly affect the visual functions. Method: Study was conducted on seventy five individuals having seven different iris color with 6/6 visual acuity and no associated ocular pathology. Visual functions were assessed by using structured Proforma in the month of August, September and October 2014. Visual acuity was assessed by Snellen visual acuity chart, color vision was assessed by ishihara color vision chart, contrast sensitivity was assessed by lea number contrast sensitivity chart, Glare sensitivity was assessed by shinning a bright light of pen torch onto the individual’s eye for 30 seconds after that visual acuity was measured within 3 to 5 second and visual field was assessed by confrontation method. Results: Hundred percent subjects with different iris color gave 6/6 visual acuity, 100% subjects gave 12/12 color vision on ishihara color vision chart, 81% individuals with different iris color gave 1.25% contrast sensitivity on lea number contrast sensitivity chart, 99% individuals with different iris color gave glare visual acuity between 6/12-6/18and 100% individuals with different iris color gave full to confrontation visual field. P value for all result was more than 0.05. Conclusion: Visual functions were not affected by different iris colors. 100% subjects of different iris colors fall in normal range of visual acuity, color vision, glare sensitivity and visual field. Anyhow 81% person represented the normal contrast. Key words: Iris color, visual acuity, contrast sensitivity, glare sensitivity, color vision, visual field