The Effect of Night Glare on Myopia

Abstract

Purpose : This study is to investigate the effect of night glare on myopia.Methods : Forty eight myopic eyes aged 20 to 30 year old were under the indoor illumination 1 lx or less for 5 minutes for the mesopic adaptation. Subjects were grouped by the equivalent spherical refraction -3.25 D. The group 1 with the refraction under -3.25 D and the group 2 with over -3.25 D were compared and analyzed. Two 100 Watt bulbs were placed by the side of the target whose illuminance at the position of subject's pupil was measured. The disability glare (contrast visual acuity and contrast sensitivity) was measured at 2, 5, and 10 lx and the discomfort glare was quantified by Deboer glare scale. The contrast acuity was measured by Reverse- Contrast chart at 100%, 25% and 10% of contrast LogMAR chart and the contrast sensitivity using the iPad program Clinic CSF 2.0 was measured at 3, 6, 12 and 18 cycles per degree.Results : The contrast acuity and contrast sensitivity of disability glare were both high in the group 1. The contrast acuity showed a significant difference after glare occurred (p 0.05).Conclusion : Considering the trend of higher nighttime activity in Korea, it is thought that not only a standard vision test for the night and the prescription to intervene the glare is needed regardless of age.