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KMID : 1011420170220010071
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 1 p.71 ~ p.80
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The Change of Accommodative Function of Vergence Anomalies Subjects in their Twenties after Near Work with Smartphone
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Kim So-Ra
Park Mi-Ok
Lee Su-Yeon
Song Jung-Hun
Lee Jae-Hun
Choi Hyun-Dong
Park Mi-Jung
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Abstract
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Purpose: The present study aimed to investigate the change of accommodative function of vergence anomalies subjects in their 20s after near work with smartphone.
Methods: Adults in their twenties (131 subjects, mean age 22.1±3.3 years) with a corrected and uncorrected visual acuity of 0.8 or better were examined and classified into normal, convergence insufficiency (CI), and convergence excess (CE) according to the function of convergence. The accommodative facility, relative accommodation, and accommodative lag were measured after watching the smartphone for 30 minutes.
Results: Monocular accommodative facility was significantly decreased in normal and CI group, and binocular accommodation facility was significantly decreased only normal group. Negative relative accommodation (NRA) decreased in 53.8% of CI group, which was different from 36.0% of normal group. In normal group of 48.0%, there was an increase in positive relative accommodation (PRA), but in CE group only 20.0% was increased. However, in CE group, the increase in PRA was greater than 1.50 D. The accommodative lag increased in 80.0% of CE group and was larger than that of the normal group(48.0%).
Conclusions: this study found that the accommodative function after near work with smartphone varies depending on the vergence function of the subject. The difference in the accommodative function induced by the variation of the vergence function may be the cause of the individual subjective symptom difference after using the smartphone.
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KEYWORD
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Smartphone, Convergence insufficiency, Convergence excess, Accommodative facility, Relative accommodation, Accommodative lag, Subjective symptom
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