The Effect of Trabeculectomy on Corneal Curvature

Authors

  • Farah Akhtar

DOI:

https://doi.org/10.36351/pjo.v24i3.693

Abstract

Purpose: To determine and evaluate pattern of changes in corneal curvature produced by trabeculectomy.

Material and Methods: 50 consecutive eyes that had trabeculectomy operations were enrolled. The visual acuity, subjective refraction and keratometry readings were recorded pre-operatively and post operatively at one week and one month. All postoperative keratometry readings were compared with the preoperative values by paired t-test. All changes in subjective refraction were analyzed by vector analysis.

Results: After trabeculectomy only 29 patients (34 eyes) turned up for regular and timely follow up. Vertical steepening was found in 19 eyes (P=.000 and P=0.009). Vertical flattening was found in 15 eyes (P=.013 and P=0.022). Horizontal steepening was found in 12 eyes (P=0.005 and P=0.13) and horizontal flattening was found in 22 eyes (P=.010 and P= 0.013). Power vector analysis showed surgically induced change in subjective refraction with a mean of -1.14D (SD ± 1.53, P=0.000), cylinder with a mean of 1.80(SD ±1.41, P=0.000) and axis with a mean of 84.42 (SD ± 47.63, P=0.000). Patients with visual acuity < 6/18 (11 eyes) did not complain of change in vision post operatively, while patients with visual acuity >6/18 complained of decreased vision post operatively.

Conclusion: The trabeculectomy procedure results in significant change of corneal curvature in both meridians. This effects post operative visual acuity which in turn may adversely effect the compliance of patients towards surgical treatment.

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Published

30-09-2008

How to Cite

1.
Akhtar F. The Effect of Trabeculectomy on Corneal Curvature. pak J Ophthalmol [Internet]. 2008 Sep. 30 [cited 2024 Mar. 29];24(3). Available from: https://pjo.org.pk/index.php/pjo/article/view/693

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Section

Review Articles