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

Ahmad Kheirkhah, Hamid Safi, Rahman Nazari, Reza Kaghazkanani, Hassan Hashemi, Mahmoud Jabbarvand Behrouz

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The purpose of this study was to evaluate the effects of pterygium surgery on front and back corneal surfaces and anterior segment parameters. This prospective study included 96 eyes with primary pterygium that underwent surgery. Preoperatively and at 1, 3, and 6 months postoperatively, Pentacam was used to evaluate front and back corneal surfaces, anterior chamber depth (ACD), anterior chamber angle (ACA) and anterior chamber volume (ACV). Mean simulated keratometry at the front corneal surface increased from 42.73 ± 2.21 D preoperatively to 44.45 ± 2.05 D at 1 month (P<0.001); it then decreased to 44.32 ± 2.07 D at 3 months (P<0.001) and 44.19 ± 2.10 Dat 6 months (P = 0.01).Therewas no statistically significant change in mean simulated keratometry at the back corneal surface. Radius of the front corneal best-fit sphere (BFS) decreased from 7.99 ± 0.29 mm preoperatively to 7.77 ± 0.25 mm at 1 month postoperatively (P<0.001), without further change up to 6 months. Radius of the back corneal BFS increased from 6.42 ± 0.24 mm preoperatively to 6.50 ± 0.24 mm at 1 month (P<0.001), without further change. Postoperative changes in mean simulated keratometry and radii of BFS had statistically significant positive correlations with pterygium extension onto the cornea and grade of pterygium morphology but, not with the surgical technique. There were no significant changes in ACD, ACA, and ACV values after pterygium surgery. Furthermore, the spherical equivalent of manifest refraction changed from +0.75 ± 1.06 D preoperatively to -0.72 ± 1.33 D at 1 month postoperatively (P = 0.001), with no further significant change. In conclusion, after pterygium surgery there were significant changes in front mean keratometry and front and back corneal radii of BFS. These were correlated with preoperative pterygium size and morphology grade. No significant changes in anterior segment parameters were noted postoperatively.

Original languageEnglish (US)
Pages (from-to)251-257
Number of pages7
JournalInternational Ophthalmology
Issue number3
StatePublished - Jun 1 2012
Externally publishedYes


  • Anterior segment parameters
  • Corneal best-fit sphere
  • Keratometry
  • Pentacam
  • Pterygium

ASJC Scopus subject areas

  • Ophthalmology


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