The Clinical Efficacy of the Haigis Formula Using A-Scan Contact Ultrasound Biometry. |
Keun Heung Park, Young Mo Cho, Jong Soo Lee |
1Department of Ophthalmology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea. jongsool@pusan.ac.kr 2Department of Emergency Medicine, The Armed Forces Medical Command, Seongnam, Korea. |
접촉식 안초음파를 이용한 하기스 공식의 임상적 유용성 |
박건형1⋅조영모2⋅이종수1 |
Department of Ophthalmology, Pusan National University Hospital, Pusan National University School of Medicine1, Busan, Korea Department of Emergency Medicine, The Armed Forces Medical Command2, Seongnam, Korea |
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Abstract |
PURPOSE To investigate the accuracy of the Haigis formula compared to other formulas using contact ultrasound biometry. METHODS: This study was performed on 94 patients (114 eyes) who underwent cataract surgery in our hospital. Axial length (AXL) and anterior chamber depth (ACD) were measured using both A-scan and intraocular lens (IOL) Master(R). Patients were divided into three groups based on AXL; Group I (AXL < 22.5 mm), Group II (22.5 mm < or = AXL < 25.5 mm), and Group III (AXL > or = 25.5 mm). Before cataract surgery, predicted refraction was calculated using the Haigis, SRK/T, Hoffer Q, and Holladay 1 formulas using both A-scan and IOL Master(R) measurements. Mean absolute error (MAE) were analyzed at one month after surgery using the various IOL formulas. RESULTS: Using contact ultrasound biometry, in Group I, MAE of Haigis was 0.80 +/- 0.67 D and was significantly lower than that using SRK/T. In Group II, the Haigis MAE was 0.72 +/- 0.55 D and was significantly lower than the results of all other formulas. In Group III, the Haigis MAE was 0.76 +/- 1.13 D and not significantly different from the results of other formulas. Comparing MAE of A-scan to IOL Master(R), the Haigis formula showed 0.16 D higher error that decreased when the AXL was close to the normal range. CONCLUSIONS: Using contact ultrasound biometry, the Haigis formula provided the best predictability of postoperative refractive outcome compared to other formulas in eyes with normal axial length. |
Key Words:
A-scan;Axial length;Cataract;Haigis formula;IOL formulas |
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