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

International Ophthalmology volume 32, pages 251–257 (2012)Cite this article

Abstract

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 D at 6 months (P = 0.01). There was 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.

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Acknowledgment

The authors have no financial interest in any material or method mentioned in this study and have received no research funding for this study.

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Affiliations

  1. Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Qazvin Square, South Kargar Street, Tehran, Iran

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

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  1. Ahmad Kheirkhah
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  2. Hamid Safi
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  3. Rahman Nazari
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  4. Reza Kaghazkanani
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  5. Hassan Hashemi
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  6. Mahmoud Jabbarvand Behrouz
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Correspondence to Ahmad Kheirkhah.

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Kheirkhah, A., Safi, H., Nazari, R. et al. Effects of pterygium surgery on front and back corneal surfaces and anterior segment parameters. Int Ophthalmol 32, 251–257 (2012). https://doi.org/10.1007/s10792-012-9560-2

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  • DOI: https://doi.org/10.1007/s10792-012-9560-2

Keywords

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