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Related Experiment Videos

Corneal asphericity and refractive error.

M Sheridan1, W A Douthwaite

  • 1Department of Optometry, University of Bradford, West Yorkshire, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1989
PubMed
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Refractive error is linked to corneal shape, but not its asphericity. Analysis shows different refractive groups share similar corneal asphericity parameters (p) and vary mainly in apical radius.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Classical keratometry measures corneal curvature, but its relationship with refractive error and corneal asphericity remains debated.
  • Understanding corneal shape is crucial for accurate refractive error assessment and correction.

Purpose of the Study:

  • To investigate the potential systematic relationship between refractive error and corneal asphericity.
  • To re-evaluate existing data on corneal curvature, refractive error, and asphericity.

Main Methods:

  • Recomputation and analysis of previously published datasets.
  • Statistical evaluation of corneal parameter 'p' and apical radius across different refractive groups.

Main Results:

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  • The parameter 'p', representing corneal asphericity, showed similar values across various refractive error groups.
  • Significant differences were observed in the apical radius of the cornea among the refractive groups.
  • This suggests that corneal asphericity does not systematically vary with refractive error.

    • Conclusions:

    • Corneal asphericity (parameter 'p') is not a primary differentiator between refractive error groups.
    • The apical radius of the cornea is the main distinguishing factor in corneal shape related to refractive error.