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Estimation of cycloplegic spherical equivalent from optical biometer Yuka Kato 1 , Maho Narita 1 , Takafumi Mori 1 , Nozomi Matsuno 1 , Koki Norikawa 1 , Ayaka Kasai 1 , Miwa Nitta 1,2 , Akiko Saito 1 , Teiko Hashimoto 1,3 , Tetsuju Sekiryu 1 1Department of Ophthalmology, Fukushima Medical University 2Department of Ophthalmology, Ohta Nishinouchi General Hospital 3Sakuramizu Sakai Eye Clinic pp.923-928
Published Date 2023/7/15
DOI https://doi.org/10.11477/mf.1410214859
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Abstract Purpose:We previously reported the prediction formula for estimating the spherical equivalent under cycloplegia based on the axial length(AL)and mean corneal radius of curvature(ROC)measured by an optical biometric device without cycloplegic. We aimed to further improve the estimation accuracy by additional morphological parameters, anterior chamber depth(ACD), and lens thickness(LT).

Subjects and Methods:We included 96 eyes of 48 children(average age in months:45.88±2.40)without structural eye disease, who underwent cycloplegic refraction examination with 1% atropine twice daily for seven days. We measured the morphology using IOL Master® 700(Carl Zeiss)and objective refraction using TONOREF®Ⅱ(Nidek)with and without cycloplegic conditions. Stepwise multiple regression analysis was performed to select effective parameters from AL, ROC, ACD, and LT under non-cycloplegia as explanatory variables and estimated spherical equivalent(eSE)under cycloplegia as the objective variable. In addition, the difference between the eSE and spherical equivalent under cycloplegia(cSE)was assessed.

Results:The three parameters of AL, ROC, and ACD were adopted by stepwise analysis. The estimating formula was calculated as follows. eSE=1200.50/AL−317.97/ROC−8.89/ACD−8.88(R2=0.93). The cSE distributed within less than ±0.5D error range in 55% eyes and within less than ±1.0D error range in 86% eyes. According to our previous report, we calculated an estimating formula with AL, ROC, and age in months(M):eSE=1147.42/AL−303.33/ROC−34.03/M−10.35(R2=0.92). The cSE distributed within less than ±0.5D error range in 48% of eyes and within less than ±1.0D error range in 85% of eyes. Since the percentage of the eyes within less than ±0.5D error range from eSE calculated by the new version formula was higher than that calculated by the previous version formula, the accuracy of the new version formula was deemed superior to that of the previous formula.

Conclusion:The additional parameter ACD in the estimating formula for calculating refractive status under cycloplegia may improve estimation accuracy.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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