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KMID : 1011420230280020077
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Journal of Korean Ophthalmic Optics Society
2023 Volume.28 No. 2 p.77 ~ p.82
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Comparison of Predicted Axial Lengths Based on Manifest and Cycloplegic Refractions in Myopia
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Kim Hyung-Soo
Kim Sang-Yeob
Moon Byeong-Yeon
Cho Hyun-Gug
Yu Dong-Sik
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Abstract
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Purpose : This study aimed to compare predicted axial length (AL) with the measured AL using the spherical equivalent refractive power and the corneal radius of curvature determined by manifest and cycloplegic refractions in myopia.
Methods : Using an auto-refractometer, objective refraction and corneal radius of curvature were measured under manifest and cycloplegic refractions. The predicted AL was calculated using an AL prediction formula and compared with the measured AL using an IOL-Master.
Results : The predicted AL for manifest and cycloplegic refractions were 25.74±1.28 mm and 25.59±1.27 mm, respectively, and the measured AL was 25.39±1.31 mm. The AL predicted from manifest and cycloplegic refractions showed a strong negative correlation with the spherical equivalent refractive power, -0.757 and -0.752, respectively. The difference between the predicted and measured AL from cycloplegic refraction, the difference between the mean values was 0.20 mm, which was more accurate than the 0.35 mm difference obtained from manifest refraction.
Conclusions : The prediction of the AL using the equivalent spherical power and the corneal radius of curvature based on cycloplegic refraction, which is more accurate than manifest refraction, may be considered more useful for the application of individualized lens designs.
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KEYWORD
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Axial length, Myopia, Manifest refraction, Cycloplegic refraction
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