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Related Experiment Video

Updated: May 6, 2026

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
05:46

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

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Keratometric astigmatism evaluation after trabeculectomy.

R Kumari, B C Saha, L R Puri

    Nepalese Journal of Ophthalmology : a Biannual Peer-Reviewed Academic Journal of the Nepal Ophthalmic Society : NEPJOPH
    |November 1, 2013
    PubMed
    Summary

    Trabeculectomy using 8-0 silk sutures initially causes significant surgically induced astigmatism (SIA), but this corneal astigmatism rapidly diminishes within three weeks post-operation.

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    Area of Science:

    • Ophthalmology
    • Corneal Surgery
    • Glaucoma Surgery

    Background:

    • Post-operative astigmatism is a primary cause of reduced vision following trabeculectomy.
    • Understanding and quantifying induced astigmatism is crucial for visual outcomes.

    Purpose of the Study:

    • To evaluate the induced corneal astigmatism after trabeculectomy using 8-0 silk sutures.
    • To assess the temporal changes in astigmatism post-surgery.

    Main Methods:

    • A prospective study of 100 eyes from 84 patients undergoing trabeculectomy with 8-0 silk sutures.
    • Surgically Induced Astigmatism (SIA) was measured using vector analysis at 1 day, 3 weeks, and 6 months post-operation.
    • Changes in with-the-rule (WTR) and against-the-rule (ATR) astigmatism were analyzed.

    Main Results:

    • Mean SIA was 2.73 D on day 1, decreasing to 0.41 D by week 3 and 0.43 D at 6 months.
    • Initial high WTR (4.46 D) and ATR (1.42 D) astigmatism on day 1 significantly reduced.
    • No significant changes in WTR or ATR astigmatism were observed between week 3 and 6 months.

    Conclusions:

    • Trabeculectomy with 8-0 silk sutures induces significant early post-operative astigmatism.
    • This surgically induced astigmatism resolves quickly, reaching minimal levels by three weeks.