Sirius光迹追踪法计算人工晶状体度数的准确性

doi:10.3969/j.issn.2095-9400.2019.02.007

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Abstract Objective: To detect the factors that influence postoperative refractive error by ray-tracing using sirius internal software in comparison with IOL-Master method and to explore the scope of the application. Methods: Sixty-four patients (80 eyes) with cataract who underwent phacoemulsification and intraocular lens (IOL) implantation in the Eye Hospital of Wenzhou Medical University from July 2016 to August 2018 were included. Axial length (AL), corneal refractive power (K) and preoperative anterior chamber depth (ACD) were measured by IOL-Master preoperatively. At the same time, the eyes were checked by sirius and the anterior chamber angle was obtained. The SRK/T, Haigis and Hoffer Q formulas were used in patients with short AL (<22 mm). The SRK/T and Haigis formulas were used in patients with normal AL between 22 mm to 26 mm and long AL (≥26 mm). The IOL calculation of all eyes was carried out by ray-tracing using sirius internal software simultaneously. Monofocal foldable IOLs were then implanted during surgery. Refractions were measured with a phoropter three months postoperatively. Refractive errors and absolute errors (AE) of the four calculation approaches were calculated based on the results of postoperative and predictive refraction. Results: Refractive errors of ray-tracing were different from SRK/T, Haigis and Hoffer Q formulas only in short AL group and long AL group (P<0.05), and AEs were different from IOL calculation formulas in all groups (P<0.05). Significant statistics difference of the refractive error of ray-tracing in multiple comparison with IOL-Master formulas was found in each AL groups (P<0.01). AE by ray-tracing was statistically different between normal AL group and long AL group, between short AL group and long AL group. Refractive error of ray-tracing was positively correlated with AL (r=0.68, P<0.01), ACD (r=0.44, P<0.01) and anterior chamber angle (r=0.34, P<0.01), but negatively correlated with K (r=-0.38, P<0.01). Conclusion: Compared with IOL-Master method, postoperative refractive error exhibits a more obvious myopic shift for eyes with a short AL while a more obvious hyperopic shift for eyes with a long AL by ray-tracing using sirius internal software. A more accurate prediction of postoperative refractive error is considered in IOL calculation formulas, especially in eyes with abnormal ALs. As AL is increased, the acd, the K is decreased the angle of anterior chamber widens and hyperopic shift increases (myopic shift decreases).

Key words： sirius ray-tracing IOL-Master cataract refractive error

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	Wei Liqing
	Nie Li
	Chen Yu
	Qian Zhenbin
	Liu Guifang
	Fu Yinghui

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https://xb.wmu.edu.cn/EN/10.3969/j.issn.2095-9400.2019.02.007 OR https://xb.wmu.edu.cn/EN/Y2019/V49/I2/108

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