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KMID : 0360220070480020251
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Journal of the Korean Ophthalmological Society
2007 Volume.48 No. 2 p.251 ~ p.258
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Comparison of IOL Formulas in Pediatric Intraocular Lens Implantation
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Kim Yeon-Deok
Kim Doh-Hyun
Park Soo-Chul
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Abstract
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Purpose: To evaluate the refractive outcomes using 5 different IOL power calculation formulas (SRK II, Holladay I, Hoffer Q, SRK T, Binkhorst II) in pediatric cataract patients.
Methods: A retrospective analysis of biometric and refractive data was performed on 63 eyes of 44 pediatric patients, who successfully underwent primary and secondary IOL implantation. For analysis, the eyes were divided into three groups: those with axial length <22.0 mm (group S); ≥22 mm but <24.5 mm (group M); and ≥24.5 (group L). And also divided into another three groups: those with mean keratomery value <42.5D (group I); ≥42.5D but <44.5D (group II); and ≥44.5D (group III). The postoperative refractive outcome was taken as a spherical equivalent of the refraction at 1 week and 2 to 3 months after surgery. The ``predictive error`` was defined as absolute error between the target and actual postoperative refraction.
Results: SRK II had a best predictive error but there was no statically significant in short eye group and medium eye group at 1 week and 2 to 3 months after the surgery. And SRK II also had a best predictive error but there was no statically significant in group I, II, and III at 1 week and 2 to 3 months.
Conclusions: In our study, theoretical formulas did not outperform the regression formula in pediatric IOL implantation. This may be related to the variability of the relationship between axial length and corneal curvature in pediatric eyes and to dependent variables inherited in the formulas. J Korean Ophthalmol Soc 48(2):251-258, 2007
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KEYWORD
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IOL formulas, Pediatric cataract, Pediatric IOL implantation, Predictive error
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