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Corneal topography and accommodation.

Tobias Buehren1, Michael J Collins, Jim Loughridge

  • 1Center for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia. t.buehren@student.qut.edu.au

Cornea
|June 7, 2003
PubMed
Summary
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Accommodation does not significantly alter corneal topography in normal or keratoconus eyes. A slight ocular excyclotorsion occurs with accommodation, affecting corneal orientation but not shape.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Accommodation is the eye's ability to change focus from distant to near objects.
  • Corneal topography measures the shape and curvature of the cornea.
  • Keratoconus is a condition causing progressive thinning and irregular shape of the cornea.

Purpose of the Study:

  • To determine if corneal topography changes during accommodation.
  • To compare these changes in normal corneas versus those affected by keratoconus.

Main Methods:

  • A modified videokeratoscope was used to measure corneal topography.
  • Subjects underwent measurements at 0, 4, and 9 diopters of accommodation demand.
  • Ocular micromovements were corrected using software, and statistical analysis was performed.

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Main Results:

  • Initial analysis suggested changes, but further review revealed significant ocular excyclotorsion with accommodation (4D and 9D stimuli).
  • After accounting for excyclotorsion, no statistically significant changes in central corneal shape were found.
  • This held true for both normal and keratoconic corneas.

Conclusions:

  • Central corneal shape is unlikely to change significantly during accommodation up to 9D.
  • Ocular excyclotorsion accompanies accommodation, influencing corneal topography orientation.
  • Findings impact the interpretation of eye optics during near vision.