Visual Acuity and Corneal Topographic Changes Related With Pterygium Surgery

Abstract

PURPOSE: Applied pre- and postoperative corneal topography outcomes with visual acuities were evaluated to determine the surgical results in pterygium therapy. METHODS: The study group consisted of 30 eyes of 26 patients with primary and recurrent pterygium. Mean patient age was 52.26±11.50 years (range: 27 to 68 years). Pre- and postoperative visual acuity and corneal topography were evaluated for each case. Statistical analysis was performed using the repeated-measure test. RESULTS: The mean uncorrected visual acuity was 0.41±0.30 preoperatively and 0.63±0.26 postoperatively (P<.001). The mean best spectacle-corrected visual acuity was 0.59±0.28 preoperatively and 0.84±0.22 postoperatively (P<.001). Surface regularity index ranged from 1.96±1.08 preoperatively to 1.09±0.76 postoperatively (P<.001). The mean surface asymmetry index was 3.05±2.85 preoperatively and 1.39±1.70 postoperatively (P=.003). The mean topographic astigmatism was 4.65±3.02 preoperatively and 2.33±2.26 postoperatively (P=.003). CONCLUSIONS: Examination of the topographic records reveals pterygium-associated corneal flattening in the horizontal meridian along the line of the pterygium. The improvement in topographic pattern and best spectacle-corrected visual acuity can be used as one indicator of the success of pterygium surgery. [J Refract Surg. 2005;21:166-170.]

Changes in Astigmatism Before and After Pterygium Surgery

“…Apex of pterygium from the limbus towards the p of pterygium and base of pterygium covering the limbus were measured. During slit-lamp examina on slit beam was focused on the nasal limbus, pterygium were graded depending on the extent of corneal ( 3,15,16,17 involvement: Sejal Maheshwari, MS, 2007) :…”

“…During manifest refrac on pa ent deals with two images, one from the more spherical temporal cornea and one from the fla er nasal cornea. The pa ent preferen ally views the more spherical image and therefore the corneal changes are 3,15,16,17 incompletely reflected in the refrac on.…”

Corneal First Surface Wavefront Aberrations Before and After Pterygium Surgery

“…[3][4][5][6][7][8] Most of these reports have used the simple topographical descriptors surface regularity index and surface asymmetry index. [3][4][5][6][7] One study derived dioptric higher order irregularity using Fourier analysis, 8 but no study has described in detail the wavefront aberrations induced by pterygia and the impact of surgery on these aberrations. Therefore, we set out to determine the higher order wavefront aberrations at the corneal fi rst surface before and after pterygium excision.…”

Effect of pterygiumseverity on visual acuity and contrast sensitivity

“…Comparison of pre and post operative corneal topography also revealed significant changes in the majority of to pographic parameters. Numerous studies have documented improvement in the corneal condition and topographic indices after pterygium excision [15,16,17].…”