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Effect of changing mesopic and photopic light conditions on visual functions

International Journal of Ophthalmology(English edition) 2023年第8期16卷 1287-1292页

作者： fatemeh mosayebi Seyyed Mehdi Tabatabaee Haleh Kangari Saeed Rahmani Department of Optometry School of RehabilitationShahid Beheshti University of Medical SciencesTehran 19839-63113Iran Department of Biostatistics School of RehabilitationShahid Beheshti University of Medical SciencesTehran 19839-63113Iran

AIM:To determine the effects of change in light conditions on refractive error and visual functions including visual acuity,stereopsis and contrast ***:This cross-sectional study was conducted in the optometry clinic of the Shahid Beheshti School of Rehabilitation on 48 students in *** of them had eye health and normal visual function and could have refractive errors or *** intensity of 4 lx was considered equivalent to photopic light condition and light intensity of 1 lx was considered to be equivalent to mesopic light *** amount of refractive error was checked by auto refractometer and its changes in mesopic light condition were subjectively ***,visual acuity,stereopsis and contrast sensitivity(in five spatial frequencies of 1.5,3,6,12,and 18 cycles per degree),were measured first in photopic light condition and then in mesopic light condition,by Snellen control vision chart,stereo butterfly test and the M&S technology monitor test ***:In the 48 student subjects with an average age of 22.69±3.56y,mean of refractive error as sphere equivalent,visual acuity and stereopsis were-1.25±1.74 diopters,0 logMAR,44.37±13.03 seconds of arc,respectively in photopic light condition while in mesopic light was equal to-1.56±1.75 diopters,0.12±0.09 logMAR and 50.62±33.35 seconds of arc,*** mean of contrast sensitivity measured at spatial frequencies of 1.5,3,6,12,and 18 cycles per degree in photopic condition was equal to 2.38±0.04,2.37±0.07,2.04±0.21,1.27±0.32,0.82±0.27 logarithm of contrast sensitivity,respectively and in mesopic lighting condition was equal to 2.34±0.12,2.30±0.16,1.84±0.28,1.02±0.28,0.63±0.24 logarithm of contrast sensitivity,*** analysis showed a significant difference between the two lighting conditions in all evaluated variables[refractive error(P<0.001),visual acuity(P<0.001),stereopsis(P=0.008)and contrast sensitivity(P<0.001)].CONCLUSION:The refractive

关键词： mesopic light condition photopic light condition visual performance visual acuity stereopsis contrast sensitivity visual functions

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