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KMID : 1011420120170030305
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 3 p.305 ~ p.309
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Aided Distance Visual Acuity and Refractive Error Changes by Using Smartphone
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Kim Bong-Hwan
Han Sun-Hee
Shin Young-Gul
Kim Da-Yeong
Park Jin-Young
Yoon Jeong-Ho
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Abstract
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Purpose: This study was conducted to research any effect on aided distance visual acuity and refractive error changes by using smartphone at near for long term.
Methods: 20(20.6±0.9 years) young adults subjects with no ocular diseases, over 0.8 of aided distance visual acuity, normal amplitude of accommodation and normal accommodative facility agreed to participate in this study. The subjects were divided into two group, Group 1 (15 cm fixation distance) included 10 subjects and Group 2(40 cm fixation distance) included 10 subjects. Aided distance visual acuity and refractive error were measured before and after using smartphone for 30 minutes by auto-chart project (CP-1000, Dongyang, Korea), phoropter (VT-20, Dongyang, Korea), auto refractor-keratometer (MRK-3100, Huvitz, Korea). After then, the subjects looked at distance with wearing spectacles. Refractive error was measured at 5 minutes, 10 minutes, and 15 minutes later, respectively.
Results: After using smartphone at 15 cm for 30 minutes, there was statistically significant reduction of aided distance visual acuity (p=0.030) and increasing myopia (p=0.001). The increased myopia was not statistically significant after 5 minutes rest (p≥0.464). However there was no statistically significant changes in aided distance visual acuity (p=0.163) and refractive error (p=0.077) after using smartphone at 40 cm for 30 minutes.
Conclusions: It is recommend to keep 40 cm off the smartphone from eyes to avoid any aided distance visual acuity and refractive error changes. If smartphone is used closer than 40 cm, a rest for 5 minutes is also recommend after every 30 minutes use with smartphone to avoid any aided distance visual acuity and refractive error changes.
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KEYWORD
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Smartphone, Distance visual acuity, Refractive error, Accommodation, Myopia
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