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Does pterygium morphology affect corneal astigmatism?

Emine Doğan1, Burçin Çakır2, Nilgün Aksoy2

  • 1Department of Ophthalmology, Sakarya University Medical Education and Research Hospital, 54000 Sakarya, Turkey.

Therapeutic Advances in Ophthalmology
|July 22, 2021
PubMed
Summary

Corneal astigmatism correlates with pterygium size and morphology, with higher astigmatism noted in the continuous pterygium pattern. Anterior segment optical coherence tomography (AS-OCT) aids in classifying pterygium morphology for clinical insights.

Keywords:
anterior segment optic coherence tomographyastigmatismmorphologypterygium

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Area of Science:

  • Ophthalmology
  • Corneal Imaging
  • Ophthalmic Surgery

Background:

  • Pterygium, a common ocular condition, can induce corneal astigmatism.
  • Understanding the relationship between pterygium morphology and induced astigmatism is crucial for patient management.

Purpose of the Study:

  • To investigate the correlation between corneal astigmatism and pterygium morphology using anterior segment optical coherence tomography (AS-OCT).

Main Methods:

  • AS-OCT was used to classify pterygium morphology into continuous and nodular patterns.
  • Corneal astigmatism, size, and extension were measured and analyzed.
  • Dual Scheimpflug analyzer was used for topographic measurements.

Main Results:

  • A moderate, statistically significant positive correlation was found between pterygium size (vertical width, area, percentage extension) and anterior corneal astigmatism in both continuous and nodular groups.
  • Anterior corneal astigmatism was slightly higher in the continuous pterygium group, though not statistically significant.

Conclusions:

  • Pterygium size and morphology, particularly the continuous pattern, are associated with increased corneal astigmatism.
  • AS-OCT provides valuable data for standardizing pterygium morphology assessment and understanding its impact on corneal optics.