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KMID : 1191420060050010010
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Korean Journal of Optometry and Vision Science
2006 Volume.5 No. 1 p.10 ~ p.14
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The Visual Fatigue Causes Accomodative Insufficiency and Convergence Insufficiency
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Kim Min-Jung
Oh Chung-Han
Park Shin-Hae
Joo Choun-Ki
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Abstract
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Purpose: To investigate the prevalence of accommodative insufficiency and convergence insufficiency and to evaluate the visual fatigue causes accommodative insufficiency and convergence insufficiency.
Methods: 80 subjects (mean age: 14.46±1.70 yrs) performed Push?up method for amplitude of accommodation and near point convergence. We evaluate the subjective visual fatigue and Critical flicker fusion frequency using Visual Fatigue Instrument (Visual Fatigue Instrument 501a, WellTech, Paju, Kyongkido, Korea) causes accommodative insufficiency and convergence insufficiency.
Results: Mean amplitude of accommodation was 15.93±6.73 D and 80% within normal range and mean near point convergence was 5.48±2.56 cm and 92.5% within normal range. Amplitude of accommodation and subjective visual fatigue showed statistical significant correlation (p=0.000). Critical flicker fusion frequency and subjective visual fatigue showed statistical significant correlation (p=0.000). However there was no statistical significant correlation in near point convergence and subjective visual fatigue (p＞0.000).
Conclusions: Accommodative insufficiency was more prevalent than convergence insufficiency and amplitude of accommodation and subjective visual fatigue showed statistical significant correlation (p=0.000). It is important to perform amplitude of accommodation for decrease visual fatigue in student.
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KEYWORD
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Accomodative insufficiency, Amplitude of accommodation, Convertgence insufficiency, Near point of convergence, Visual fatigue
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