无病史资料的角膜屈光术后IOL度数测算方法的比较

doi:DOI:10.3760/cma.j.issn.1674-845X.2017.01.010

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Abstract

Objective To evaluate the accuracy of different methods of calculating intraocular lens (IOL) power after corneal refractive surgery without medical histories. Methods In this retrospective case series study, 33 patients were chosen after corneal refractive surgery with cataract extraction. Five methods were used to calculate IOL power: Haigis-L formula, Shammas formula, Olsen 2 formula, Pentacam mTNP, and optical coherence tomography (OCT)-based IOL formula. The prediction error (PE) was determined as the difference between the actual postoperative refraction and the predicted refraction, and the absolute value of the PE was the absolute error (AE). The percentages of PE within ±0.50, ±1.00, and ±1.50 diopters (D) were calculated. The results were analyzed with t-tests, randomized block design of variance, and chi-square test. Results The PEs calculated by the OCT-based, Shammas, and Haigis-L formulas were significantly different from zero (t=-4.96, -4.61, -6.61, P＜0.05). The PEs for the Olsen 2 formula and the Pentacam mTNP were similar, and the PEs for the OCT-based IOL, Shammas and Haigis-L formulas were similar to each other. However, the PEs for the Olsen 2 formula and the Pentacam mTNP were larger than those for the Shammas and Haigis-L formulas (P＜0.05). For the AE, there was no difference between Olsen 2 formula and Pentacam mTNP formula, and there was no difference between the OCT-based IOL formula and Shammas formula for AE too. The AEs for the Olsen 2 formula and the Pentacam mTNP method were less than the AEs for OCT-based IOL and the Shammas formulas (P＜0.05). The AE for the Haigis-L formula was not significantly different from the other four methods. The percentage of correct refraction prediction within ±1.00 D was 48% for OCT-based IOL formula, 50% for Shammas, 62% for Haigis-L, 81% for Olsen, and 85% for the Pentacam method. There were no differences between the OCT-based IOL and Shammas formulas or between the Olsen 2 formula and the Pentacam mTNP method. However the percentage of correct refraction predictions within ±1.00 D for the OCT-based IOL and Shammas formulas was less than for the Olsen 2 formula and the Pentacam mTNP method (P<0.05). The prediction for the Haigis-L formula was not significantly different from the other four formulas. Conclusion After corneal refractive surgery, the Olsen 2 formula and Pentacam mTNP method gave better results than did the Haigis-L, Shammas, and OCT-based IOL formulas. These conclusions need to be confirmed with a larger study population.

Key words： Corneal refractive surgery Cataract Intraoculor lens power calculation

Received: 26 August 2016

Corresponding Authors: HUANG Yusen, Email: huang_yusen@126.com

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	LIU Xiaomin
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Cite this article:

LIU Xiaomin,HUANG Yusen. Comparison of methods to calculate IOL power after corneal refractive surgery without history data[J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2017, 19(1): 53-57.

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https://www.cjoovs.com/EN/DOI:10.3760/cma.j.issn.1674-845X.2017.01.010 OR https://www.cjoovs.com/EN/Y2017/V19/I1/53

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