Anterior Segment Parameter Analysis After SMILE Surgery and Its Impact on the Calculation of Effective Intraocular Lens Position

A large hospital of Hebei Medical University made a prospective study. The subjects are a group of people who have undergone SMILE surgery in the second half of 2020.Clinical examinations were made before operation and 1st and 3rd Month Post-Surgery, respectively, and the results of naked eye vision, diopter, intraocular pressure, slit lamp microscope examination, as well as data of Pentacam (corneal diopter, central corneal thickness, anterior chamber depth) and IOL-Master (corneal power, aqueous depth, axial length) were recorded. In addition, supplementary parameters such as corneal thickness and cutting depth were recorded. We used paired t test to compare the changes of corneal diopter, anterior chamber dimensions and axial measurement measured by Pentacam and IOL-Master before and after SMILE operation. The same method is also used to compare the estimated lens position (ELP) calculated from IOL-Master and Pentacam data according to Holladay I and Haigis formula, and p-value below 0.05 denotes significance. In addition, Pearson correlation coefficient was used to analyze the relationship between the changes of anterior chamber depth measured by IOL-Master and Pentacam before and after SMILE operation and the corneal ablation depth.