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Eye (Lond). 2001 Dec;15(Pt 6):766-9.

Corneal shape change during accommodation.

Author information

  • 1Department of Biomedical Sciences, University of Bradford, West Yorkshire, UK. b.pierscionek@bradford.ac.uk

Abstract

PURPOSE:

To investigate whether accommodation induces any changes in central corneal curvature.

METHODS:

Shape changes were measured on 14 subjects using a keratometer modified to enable a change in focus to occur without a change in vergence. All subjects were emmetropic and their ages ranged from approximately 20 to 28 years.

RESULTS:

In 11 of the 14 subjects a difference in central corneal curvature, of around 0.4 D in at least one principal meridian, was found when focus was changed between distant and near targets. In 9 subjects the curvature was greater for near focus in at least one meridian. In 5 subjects the change in one meridian was opposite in effect to what would be expected, i.e. the curvature was greater at distance than at near.

CONCLUSION:

The study suggests that accommodation may have some effect on corneal shape.

[PubMed - indexed for MEDLINE]
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