Influence of pterygium size on corneal higher-order aberration evaluated using anterior-segment optical coherence tomography.

ABSTRACT:

Background

The prospective observation study aimed to evaluate changes in corneal higher-order aberrations induced by advancement of pterygium using an anterior-segment optical coherence tomography (AS-OCT) and Zernike aberration analysis.

Methods

The corneal topography of 284 eyes with primary pterygia originating from the nasal region was measured using an AS-OCT (SS-1000, Tomey). With anterior corneal elevation data, Zernike polynomial coefficients were calculated in diameters of 1.0, 3.0, and 5.0 mm, and the coma, spherical, coma-like, spherical-like, and total higher-order aberrations were obtained. Pterygium size was also measured as a ratio of positions of the pterygium end with respect to the corneal diameter and categorized in eight classes: less than 15%, 15-20%, 2

SUBMITTER: Minami K 

PROVIDER: S-EPMC6038341 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature