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KMID : 1191420120110010001
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Korean Journal of Optometry and Vision Science
2012 Volume.11 No. 1 p.1 ~ p.6
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Comparison of Measurements by Hand-Held Autorefractor, On-Table Autorefractor and Retinoscopy in Children
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Lee Jeong-Hun
Lee Keun-Woo
Kim Sook-Young
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Abstract
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Purpose: To evaluate the accuracy and utility of the hand-held autorefractor, compared with on-table autorefractor and retinoscopic refraction in children.
Methods: Ninety children underwent autorefraction by hand-held autorefractor (Nikon Retinomax K-plus 2, Nikon, Tokyo, Japan) and on-table autorefractor (Humphrey ARK 599, Humphrey Inc., Dublin, CA, USA) without cycloplegia. Among them, 30 children underwent both two autorefraction and retinoscopic refraction under cycloplegia. We compared sphere, cylinder, cylinder axis, and spherical equivalent in each test.
Results: Measurement data of hand-held autorefractor was 0.70 D more myopic in sphere, and 0.68 D more myopic in spherical equivalent than that of on-table autorefractor without cycloplegia. But there was no significant difference in cylinder and its axis on both noncycloplegic and cycloplegic eyes between the two autorefractors. Compared with the cycloplegic refraction measurement, we found no significant difference from the measurement data of Retinomax. Analysis of the measurement data showed coefficient of high correlation between the two autorefractors with or without cycloplegia.
Conclusions: The hand-held autorefractor is a useful instrument to screen refractive errors in young, uncooperative children.
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KEYWORD
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Autorefractor, Refraction, Retinoscopy
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