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KMID : 1011420140190010105
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 1 p.105 ~ p.109
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Change of Refractive Error after Watching Smart-phone under Low Intensity of Illumination
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Kim Bong-Hwan
Han Sun-Hee
Kwon Sang-Jin
Kim Mi-Sung
Jeong Hyun-Seung
Kim Hak-Jun
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Abstract
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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±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 autochart 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±2.00 D to ?3.38±2.00 D (p=0.006) and corrected distance visual acuity was changed from 0.93±0.08 to 0.91±0.10 (p=0.000) and NIBUT was changed from 10.48±7.00 seconds to 10.29±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.
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KEYWORD
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Smart-phone, Intensity of illumination, Refractive error, NIBUT, Visual acuity
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