Evaluation of corneal topographic changes after pterygium surgery
Session Details
Session Title: Presented Poster Session: Miscellaneous and Infections
Venue: Poster Village: Pod 3
First Author: : M.Tłustochowicz POLAND
Co Author(s): : K. Krix-Jachym R. Rozycki M. Rekas
Abstract Details
Purpose:
The purpose of this study was to to evaluate the corneal refractive status before and after pterygium surgery. Pre- and postoperative corneal topography outcomes were evaluated to determine the surgical results.
Setting:
Military Institute of Medicine in Warsaw, Poland
Methods:
The study included 70 eyes of 65 patients who underwent pterygium surgery with grafting. All patients underwent on each visit (before and 1, 30, 90, 180 and 360 days after surgery) measurement of BCVA, autorefractometry and corneal topography. Keratometric and refractive outcomes were evaluated by vector analysis. Aggregate astigmatism was calculated after converting polar values of astigmatism to Cartesian values. Coordinates were calculated using trigonometric functions. Surgically induced astigmatism (SIA), corneal spherical power and irregularity of the cornea were analyzed.
Results:
The preoperative centroid values showed with the rule astigmatism in eyes with pterygium, which decreased after surgery. The value of centroid of astigmatism was 1,68 before surgery and 0,74 one year after surgery. Corneal spherical power was 43,242 ± 2,57 diopters preoperatively and 43,815 ± 1,56 postoperatively (360 days after surgery) (p<0,05). 180 days after surgery SIA was 1,70 (MD 2,33) whereas 360 days after surgery it was 1,67 (MD 2,5). There was a statistically significant change in the value of astigmatism measured before and the year after surgery (p=0,001).
Conclusions:
The presence of pterygium and its removal significantly influence the corneal refraction including spherical power, astigmatism and irregularity of the cornea. Changes in corneal shape were mainly a decrease in midline corneal flattening. After surgery mean astigmatism decreased and was with the rule. Significant increase in spherical power after surgery demonstrates that flattening of the central cornea caused by pterygium is reversible by surgical removal.
Financial Disclosure:
NONE
