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Related Experiment Videos

Corneal topographic changes induced by pterygia

M A Pavilack1, B L Halpern

  • 1Department of Ophthalmology, St Joseph Hospital, Lancaster, PA, USA.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|March 1, 1995
PubMed
Summary

Pterygia cause localized corneal flattening, measured using videokeratoscopy. This study quantifies this topographic change, revealing significant flattening central to the pterygium apex.

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Area of Science:

  • Ophthalmology
  • Corneal topography
  • Ocular surface disease

Background:

  • Pterygia are wing-shaped growths on the eye's surface.
  • Understanding pterygium-induced corneal changes is crucial for patient management.

Purpose of the Study:

  • To characterize the specific topographic changes in the cornea caused by pterygia.
  • To quantify the degree of corneal flattening associated with pterygium growth.

Main Methods:

  • Utilized videokeratoscope (TMS-1) data from 24 eyes with pterygia.
  • Assessed corneal topography and measured refractive power at various points.

Main Results:

  • Pterygia induced a localized area of corneal flattening central to the apex.
  • This flattening measured 38.00 +/- 2.80 diopters (D), significantly less than surrounding corneal power.
  • Compared to mean corneal power (43.70 +/- 1.70 D) and minimum corneal power (42.70 +/- 2.10 D).

Conclusions:

  • Corneal topography reveals localized flattening central to pterygium apex.
  • The impact of this flattening on pterygium growth and visual axis crossing remains undetermined.

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