Abstract

Purpose: To evaluate corneal higher-order aberrations (HOA) values in myopic patients who are candidates for laser refractive surgery.

Methods: Preoperative exam data of myopic laser refractive surgery candidates are evaluated. The preoperative exam consists of uncorrected (UCDVA) and best spectacle-corrected (BSCVA) distance visual acuity, intraocular pressure, and biomicroscopy of the anterior and posterior segment. Keratometry, corneal pachymetry, and HOA measurements are gathered through Scheimpflug imaging. Higher-order aberrations were measured at 4 mm pupil diameter. All candidates were divided into four groups according to their refractive error: Group I (-0.50 to -2.00), Group II (-2.25 to -4.00), Group III (-4.25 to -6.00), and Group IV (-6.25 to -8.00).

Results: A total of 1630 myopic patients (3060 eyes) were enrolled in this study. Mean spherical equivalent (SE) for all groups was -3.91 ± 1.95. The mean value of RMS Coma was 0.29 ± 0.15 and RMS spherical aberration (SA) was 0.23 ± 0.06. Two groups showed a statistically significant increase in RMS coma and only one group in RMS SA.

Conclusion: There was no overall statistically significant increase in corneal HOA between the groups. The focus of future studies could be on the evaluation of corneal and ocular HOA in myopic patients.

Keywords: Higher-Order Aberration; Myopia; Value

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