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Related Experiment Videos

Refractive change following pterygium surgery

K S Fong1, V Balakrishnan, S P Chee

  • 1Singapore National Eye Center, Singapore.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|May 8, 1998
PubMed
Summary

Pterygium surgery reverses corneal flattening, with larger pterygia causing more astigmatic change. This study analyzed surgically-induced astigmatism in relation to pterygium size and morphology.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Astigmatism Analysis

Background:

  • Pterygium is a common ocular condition causing visual impairment.
  • Surgical excision is the primary treatment for pterygium.
  • Understanding surgically-induced astigmatism is crucial for visual outcomes.

Purpose of the Study:

  • To analyze surgically-induced astigmatic changes after pterygium surgery.
  • To investigate the relationship between astigmatism and pterygium morphology/size.
  • To evaluate changes in corneal curvature post-excision.

Main Methods:

  • Prospective study of 123 patients with primary pterygia.
  • Pterygium grading based on morphology and corneal encroachment.
  • Preoperative and postoperative manifest refraction at 1, 3, and 6 months.

Related Experiment Videos

  • Analysis of surgically-induced astigmatism using Olsen's vector decomposition method.

    • Main Results:

    • Preoperative astigmatism averaged 0.99 D, with horizontal corneal flattening.
    • Significant astigmatism (≥1.00 D) observed with pterygia >3.5 mm.
    • Postoperative results showed horizontal corneal steepening correlated with pterygium size (P=0.0001).
    • No significant difference in astigmatism based on pterygium morphology.

    Conclusions:

    • Pterygium excision effectively reverses pterygium-related corneal flattening.
    • A strong correlation exists between pterygium size and induced astigmatic changes.
    • Surgical outcomes are predictable based on pterygium encroachment extent.