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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Astigmatism Research

Background:

  • Surgically induced astigmatism (SIA) is a significant concern following ophthalmic procedures, potentially reducing uncorrected visual acuity and causing patient discomfort.
  • Trabeculectomy, a common glaucoma surgery, can alter corneal astigmatism, necessitating an understanding of its impact.

Purpose of the Study:

  • To evaluate the degree of SIA after trabeculectomy performed at the 120° meridian.
  • To identify factors, such as postoperative intraocular pressure and surgical site, correlated with SIA following this procedure.

Main Methods:

  • Retrospective review of patient medical charts undergoing trabeculectomy at the 120° meridian by a single surgeon.
  • Comparison of preoperative keratometric data with postoperative data (2-12 months) using Naeser's polar value analysis for SIA evaluation.

Main Results:

  • Trabeculectomy at the 120° meridian resulted in a mean SIA (ΔKP(120)) of 0.7 ± 0.7, indicating a with-the-rule change.
  • Postoperative intraocular pressure and surgical location (superonasal vs. superotemporal) were identified as independent factors significantly associated with SIA (p=0.002 and p=0.03, respectively).

Conclusions:

  • Trabeculectomy at the 120° meridian is not astigmatically neutral.
  • SIA appears to be more pronounced in eyes with lower postoperative intraocular pressure and a superonasal surgical wound compared to a superotemporal wound.