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Related Experiment Videos

Corneal topography after ocular rubbing.

Ahmad M Mansour1, Randa S Haddad

  • 1Department of Ophthalmology, American University of Beirut, Beirut, Lebanon. dr.ahmad@cyberia.net.lb

Cornea
|November 1, 2002
PubMed
Summary
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Ocular rubbing significantly alters corneal topography, increasing surface irregularity and inducing minor astigmatism. These effects are temporary, returning to baseline within five minutes post-rubbing.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Science

Background:

  • Corneal topography is crucial for diagnosing and managing various eye conditions.
  • Understanding factors that influence corneal measurements is essential for accurate clinical interpretation.

Purpose of the Study:

  • To investigate the immediate impact of ocular (eyelid) rubbing on corneal topography measurements.
  • To quantify changes in corneal surface regularity and astigmatism following eye rubbing.

Main Methods:

  • Corneal topography was performed on 29 healthy volunteers.
  • Measurements were taken before, immediately after, and 5 minutes after eyelid rubbing.

Main Results:

  • Immediately after rubbing, the surface regularity index significantly increased (0.24 to 0.91, p<0.0001).

Related Experiment Videos

  • Surface asymmetry index also rose significantly (0.27 to 0.89, p=0.0018).
  • A small induction of astigmatism (0.5 diopters, p=0.01) was observed immediately post-rubbing.

    • Conclusions:

    • Ocular rubbing should be avoided before standard corneal topography procedures.
    • Observed changes in corneal topography likely result from tear film alterations and/or temporary corneal surface molding.