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KMID : 0360220150560101558
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Journal of the Korean Ophthalmological Society
2015 Volume.56 No. 10 p.1558 ~ p.1565
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Comparison of Ocular Biometry Using Low-Coherence Reflectometry with Other Devices for Intraocular Lens Power Calculation
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김지원:Kim Ji-Won
이훈:Lee Hoon/정지원:Jung Ji-Won/김진선:Kim Jin-Sun/이형근:Lee Hyung-Keun/서경률:Seo Kyoung-Yul/김응권:Kim Eung-Kweon/김태임:Kim Tae-Im
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Abstract
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Purpose: To compare axial length (AL) and keratometry (K) using optical low-coherence reflectometry (OLCR, Lenstar LS900ⓡ, Haag- Streit, Bern, Switzerland) with current ocular biometry devices and evaluate the accuracy of intraocular lens (IOL) power calculation.
Methods: In this prospective, comparative observational study of eyes with cataracts, AL and K were measured using an OLCR device (Lenstar LS900ⓡ, Haag-Streit), partial coherence interferometry (PCI, IOL Masterⓡ, Carl Zeiss, Jena, Germany), A-scan (Eyecubed) and automated keratometry (KR-7100, Topcon, Tokyo, Japan). IOL power calculation was performed using the Sanders-Retzlaff-Kraff (SRK/T) formula. The IOL prediction error (PE) was calculated by subtracting the predicted IOL power from the postoperative (PO) IOL power (PO 4 weeks, PO 12 weeks).
Results: A total of 50 eyes of 39 patients with cataracts (mean age 67.12 ± 8.51 years) were evaluated in this study. AL and K were not significantly different between the OLCR device and other devices (analysis of variance [ANOVA], p = 0.946, 0.062, respectively). The mean PE in IOL power calculation was -0.22 ± 0.50D with the OLCR device, 0.08 ± 0.45D with the PCI device and -0.01 ± 0.48D with A-scan and automated keratometry (ANOVA, p = 0.006). The highest percentage of eyes with PE smaller than ± 0.5D was IOL Masterⓡ followed by Eyecubed and then Lenstar LS900ⓡ. The mean absolute PE was not statistically significant among the 3 devices (ANOVA, p = 0.684).
Conclusions: Ocular biometry measurements were comparable between the OLCR device and the PCI ultrasound device. However, the IOL power prediction showed significant differences among the 3 devices. Therefore, the differences in application of these devices should be considered.
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KEYWORD
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Axial length, IOL-Master, Keratometry, Lenstar LS900, Optical low-coherence reflectometry (OLCR)
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