| Intraocular Lens Power Calculations Using Dual Scheimpflug Analyzer. |
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Young Bok Lee, Ka Young Yi, So Hyun Bae, Ha Kyoung Kim, Joon Young Hyon, Won Ryang Wee, Young Joo Shin |
1Department of Ophthalmology, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea. schinn@hanmail.net
2Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
3Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea. |
| 이중샤임플러그 전안부분석기를 이용한 백내장 수술 시 인공수정체 도수 계산 |
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이영복1⋅이가영1⋅배소현1⋅김하경1⋅현준영2,3⋅위원량2⋅신영주1 |
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한림대학교 의과대학 강남성심병원 안과학교실1, 서울대학교 의과대학 안과학교실2, 서울대학교 의과대학 분당서울대학교병원 안과학교실3 |
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| Abstract |
PURPOSE
To investigate the accuracy of intraocular lens power calculations using simulated keratometry (simK) of dual Scheimpflug analyzer and 5 types of formulas in cataract patients. METHODS: The keratometry (K), axial length (AXL) and anterior chamber depth (ACD) were measured using ultrasound biometry (USB) combined with auto-keratometry (Auto-K), parital coherence interferometry (PCI; IOL master®) and dual Scheimpflug analyzer (DSA; Galilei®) in 39 eyes of 39 patients. Predicted refraction was calculated using Auto-K, mean K of PCI, and simK and total corneal power (TCP) of DSA in the Sanders-Retzlaff-Kraff (SRK-T) formula. The SRK-II, SRK-T, Holladay II, Haigis, and Hoffer-Q formula were used to calculate predicted refraction with the simK of DSA and AXL of USB. Manifest refraction, mean numerical error (MNE) and mean absolute error were evaluated 1, 3 and 6 months after cataract surgery. RESULTS: TCP of DSA was lower compared with other keratometric values (p < 0.05). The MNE was not different among Auto-K, mean K and simK. The MNE using TCP was larger compared with Auto-K, mean K and simK at 1 month after surgery (p < 0.05). There was a difference in MNE between simK and TCP of DSA at 6 months after surgery (p < 0.05). The MNE of SRK-T formula was the smallest in the intraocular lens (IOL) power calculation using the simK of DSA. CONCLUSIONS: We suggest using IOL power calculations with simK of DSA and SRK-T formula rather than TCP of DSA in cataract patients with normal corneas. |
| Key Words:
Cataract surgery;Dual Scheimpflug analyger;Intraocular lens power calculation |
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