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http://dx.doi.org/10.14479/jkoos.2014.19.1.105

Change of Refractive Error after Watching Smart-phone under Low Intensity of Illumination  

Kim, Bong-Hwan (Dept. of Optometry, Choonhea College of Health Sciences)
Han, Sun-Hee (Dept. of Optometry, Choonhea College of Health Sciences)
Kwon, Sang-Jin (Dept. of Optometry, Choonhea College of Health Sciences)
Kim, Do-Hun (Dept. of Optometry, Choonhea College of Health Sciences)
Kim, Mi-Sung (Dept. of Optometry, Choonhea College of Health Sciences)
Jeong, Hyun-Seung (Dept. of Optometry, Choonhea College of Health Sciences)
Kim, Hak-Jun (Dept. of Optometry, Choonhea College of Health Sciences)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.19, no.1, 2014 , pp. 105-109 More about this Journal
Abstract
Purpose: To compare the change of visual acuity and NIBUT after watching smart-phone in 1 hour under low intensity of illumination. Methods: 50 subjects (male 22, female 28) aged 20's years old ($20.7{\pm}2.4$ years) who do not have eye disease and have a good eye condition were participated for this study. Objective refraction, corrected distance visual acuity and NIBUT were measured before and after watching smart-phone (Galaxy 2, Samsung, KOREA) under low intensity of illumination (0 lx.) Objective refraction was carried out using auto-chart project (CP-1000, Dongyang, Korea), phoropter (VT-20, Dongyang, Korea) and auto refractor-keratometer (MRK-3100, Huvitz, Korea). Results: Refractive error was changed from $-3.20{\pm}2.00$ D to $-3.38{\pm}2.00$ D (p=0.006) and corrected distance visual acuity was changed from $0.93{\pm}0.08$ to $0.91{\pm}0.10$ (p=0.000) and NIBUT was changed from $10.48{\pm}7.00$ seconds to $10.29{\pm}6.47$ seconds (p=0.761) before and after watching smart-phone under low intensity of illumination. Conclusions: Continuous watching smart-phone under low intensity of illumination lead to temporal change of distance visual acuity and suitable rest may reduce the influence of distance visual acuity and tear safety.
Keywords
Smart-phone; Intensity of illumination; Refractive error; NIBUT; Visual acuity;
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Times Cited By KSCI : 2  (Citation Analysis)
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