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KMID : 1011420120170020153
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 2 p.153 ~ p.158
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CA/C Ratio of Adults in Their Early Twenties with Normal Binocular Vision
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Lee Mu-Hyuk
Yu Dong-Sik
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Abstract
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Purpose: The purpose of this study was to evaluate the convergence accommodation to convergence (CA/C) ratio
and to investigate relationships among age, accommodative amplitude and PD (interpupillary distance) of adults
in their early twenties with normal binocular vision. Methods: 44 subjects (mean age, 21.75±1.16 years) with
healthy eyes were examined. The CA/C ratios were measured by using the difference of Gaussian (DOG) target
with retinoscopy. Results: The mean CA/C ratio was 0.052±0.017 D/Δ. A moderate negative correction was
present between CA/C ratio and age (r = ?0.50, p = 0.0005), and a highly positive correction was found between
CA/C ratio and accommodative amplitude (r = 0.79, p<0.0001). There was no relation between PD and CA/C
ratio. Conclusions: The CA/C ratio presented was mean value for adults in their early twenties with healthy eye
between 19 and 25 years of age. There was a high correlation between accommodative amplitude and CA/C ratio.
Therefore, the CA/C ratio will be useful basic information for comparison in age, gender and binocular anomalies
with similar data from other countries.
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KEYWORD
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CA/C비 Convergence accommodation, Accommodation, Convergence, CA/C ratio
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