Accuracy of constant C for ray tracing-assisted intraocular lens power calculation in normal ocular axial eyes.

Abstract:

OBJECTIVE:To evaluate the effect of C constant for ray tracing-assisted intraocular lens (IOL) power calculation in the patients with different refractive power, we compared the refractive outcome of ray-tracing method based on C constant and conventional IOL calculation formula. METHODS:215 eyes which underwent phacoemulsification and IOL implantation were enrolled. According to the average corneal power, patients were divided into three groups: high corneal power(K>45D) group, medium corneal power (43D≤K≤45Dm) group and low corneal power(K<43D) group. The predicted sphero-equivalent refractive outcome for the IOL power implanted at surgery were calculated using ray tracing method, SRK/T and Haigis formulas. RESULTS:On the basis of the corneal refractive power, there were 65 eyes of K>45D group (30.23%), 96 eyes of 43D≤K≤45Dm group (44.65%),54 eyes of K<43D (25.12%). In general, the ray tracing group had the smallest value of MAE and ME, and the proportion of the eyes which AE<0.50D and AE<0.75D was significantly higher than that of the other two formulas (P=0.010). In each group, the value of MAE was smallest in the ray tracing group. And for the proportion of AE<0.50D,<0.75D, the ray tracing group was higher than SRK/T and Haigis groups. Especially, in the high corneal refractive group and low corneal refractive group, the proportion of AE<0.25D was also obviously higher, but only in low corneal refractive power group, the difference had statistically significant(P=0.006). CONCLUSIONS:Compared with the conventional formulas, C constant for ray tracing-assisted IOL power calculation has more accuracy for the patients with different corneal refractive powers. Ray tracing could provide better guidance for the selection of IOL clinically.

journal_name

Ophthalmic Res

journal_title

Ophthalmic research

authors

Chang P,Zhang F,Wang J,Zhao Y

doi

10.1159/000507963

subject

Has Abstract

pub_date

2020-04-20 00:00:00

eissn

0030-3747

issn

1423-0259

pii

000507963

pub_type

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