An Overview of Corneal Topography and Visual Outcomes after Different Pterygium Surgeries: An Interventional Case Series Study

Abstract

INTRODUCTION: To investigate corneal topography and visual outcomes after different pterygium surgical techniques using Pentacam Scheimpflug device METHODS: Ninety-eight unilateral primary nasal pterygium patients underwent surgery under topical anesthesia with either conjunctival autograft (group 1) or anchored conjunctival rotational flap (group 2), both using fibrin tissue adhesive. Baseline and three-month post-operative best-corrected visual acuity (BCVA) and anterior corneal astigmatism (ACA), flattest keratometry (Kf), steepest keratometry (Ks) and posterior corneal astigmatism (PCA) were investigated. RESULTS: In groups 1 and 2, the mean logMAR BCVA increased from 0.119+-0.113 to 0.082+-0.086 and 0.169+-0.128 to 0.120+-0.121, respectively (p<0.001 for both). There were no significant differences between the two groups in pre- and post-operative ACA, PCA, Kf and Ks (p=0.686; 0.902; 0.107; and 0.592, respectively). Intra-group analysis revealed significant differences in both groups: ACA (p<0.001 for both), with a greater difference in group 1 (2.072), and Kf (p<0.001 for both), with a slightly greater difference in group 2 (1.910). Intra-group analysis revealed no statistically significant PCA changes for either group (p=0.061 for both). DISCUSSION AND CONCLUSION: Significantly improved anterior corneal topographic changes were found to be highly related to conjunctival autografting. Conjunctival rotational flap, on the other hand, was associated with significantly greater posterior corneal topographic changes.

Keywords

• conjunctival autograft
• conjunctival rotational flap
• corneal topography
• pentacam scheimpflug imaging
• pterygium