Effect of Pterygium Surgery on Refractive Spherocylinder Power and Corneal Topography

Abstract

Pterygium surgery produces improvements in visual acuity, decreases of refractive spherocylinder power, topographic irregularity, and topographic astigmatism. Three-millimeter topographic irregularity and astigmatism have a close correlation with refractive spherocylinder power.

Effects of pterygium surgery on front and back corneal surfaces and anterior segment parameters

“…Previously, Errais et al reported a significant myopic shift in MRSE from -0.54 ± 3.29 D before surgery to -1.3 ± 3.05 D at 3 months postoperatively [11]. In addition, a myopic shift of 0.60-0.65 D in the refractive sphere also has been demonstrated before [9,13]. It has been shown that the amount of spherical power changes induced by the removal surgery has significant correlation with the preoperative pterygium size [6].…”

“…In contrast to the non-significant increase in the radius of back corneal curvature, changes in the radius of back cornea BFS were statistically significant. Using slit scanning by Orbscan (Bausch & Lomb, Berlin, Germany), Wu et al showed a non-significant increase in anterior BFS from 43.28 ± 2.50 D preoperatively to 43.76 ± 2.07 D at 158.5 ± 30.9 days after surgery; posterior BFS showed a non-significant decrease from 51.87 ± 3.44 to 51.72 ± 3.40 D [13]. Interestingly, in contrast to other previous studies [6][7][8][9][10][11][12], that study also did not find any significant change in 3 and 5 mm corneal powers after the surgery.…”

“…Even without involvement of the optical zone, pterygium can produce significant alterations in corneal shape and curvature. Thus, many studies have shown that pterygium is associated with regular and irregular astigmatism as well as changes in corneal curvature and refractive status, which improve at least in part after the surgery [1][2][3][4][5][6][7][8][9][10][11][12][13]. Corneal curvature in these studies has been investigated with corneal topography, which evaluates the front corneal surface.…”

Effect of Limbal Conjunctival Autogreft Treatment on Corneal Astigmatism in Pterygium Patients

“…18 Wu ve ark., 24 hastanın 27 gözünü içeren çalışmalarında, piterjiyum postoperatif görme keskinliğinde düzelme ve topografik olarak korneal astigmatizmada azalma saptamışlardır. 19 Maheshwari, 36 primer piterjiyumlu gözde postoperatif korneal astigmatizmanın anlamlı olarak azaldığını bildirmiştir. 20 Mayalı; konjonktival otogreft uygulanan 22 primer piterjiyumlu gözden oluşan çalışmasında, postoperatif ortalama birinci ayda gözlerin yaklaşık %60'ında kurala aykırı astigmatizma saptamış ve postoperatif görme keskinliğindeki artışın, istatistiksel olarak anlamlı olmadığını bildirmiştir.…”

The impact of surgical excision on pterygium induced astigmatism

“…The result in the present study correlate with existing studies in literature. Wu PL et al (10) (2009) studied 27 eyes of pterygium and found statically significant improvement in induced astigmatism (p value<0.001). Maheshwari et al (11) (2003) studied 36 patients and found that pterygium is associated with "induced astigmatism" and causes significant impact on vision.…”