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KMID : 1011420140190020253
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 2 p.253 ~ p.260
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Changes in Accommodative Function of Young Adults in their Twenties following Smartphone Use
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Park Mi-Jung
Ahn Young-Joo
Kim Soo-Jung
You Ji-young
Park Kyung-Eun
Kim So-Ra
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Abstract
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Purpose: The present study was conducted to investigate whether near work with smartphone could induce the change of accommodative function.
Methods: Total 63 subjects(26 male and 37 female) in their 20s were firstly examined their visual functions related to accommodation and uncorrected spherical equivalent power as the control. After that, the subjects were asked to read a book for 30 min and sequentially watch a movie on smartphone for the same time after 30 min-break under the indoor light or as it was in the reverse order to avoid time-ordered effect. Their accommodative functions, 1) accommodative amplitude, 2) accommodative facility, 3) relative positive/negative accommodation, and 4) accommodative lag and their uncorrected spherical equivalent power were examined again following each task and compared with the control values.
Results: The monocular accommodative amplitude was significantly decreased after smartphone watching compared with it after reading. The monocular and binocular accommodative facilities were tended to reduce after smartphone watching and book reading but were not significantly different. Neither significant change in positive relative accommodation was determined after smartphone watching nor book reading. Negative relative accommodation after smartphone watching was almost unchanged unlike reading a book. The accommodative lag after smartphone work was significantly higher than after book reading.
Conclusions: The near work with a smartphone for 30 min induced the change of some accommodative functions, which was significantly greater than when reading under the same working environment.
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KEYWORD
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Accommodative amplitude, Accommodative facility, Accommodative lag, Near work, Relative accommodation, Smartphone
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