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Related Experiment Videos

Changes in corneal curvature in accommodation.

Akihiro Yasuda1, Tatsuo Yamaguchi, Kishiko Ohkoshi

  • 1Department of Ophthalmology, St. Luke's International Hospital, Tokyo, Japan. akiyasu@luke.or.jp

Journal of Cataract and Refractive Surgery
|August 6, 2003
PubMed
Summary

Corneal curvature steepens during accommodation, with K-values significantly increasing across central corneal zones. These corneal changes suggest they play a role in the eye's focusing mechanism.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accommodation is the eye's ability to change focus from distant to near objects.
  • The precise mechanisms of accommodation, particularly the role of corneal changes, are not fully understood.

Purpose of the Study:

  • To investigate and quantify changes in corneal curvature during the process of accommodation.
  • To determine if alterations in corneal topography contribute to the accommodative response.

Main Methods:

  • Prospective study involving 14 healthy volunteers (28 eyes).
  • Corneal topography was performed before and during maximal accommodation.
  • Keratometric values (K-values) were compared between the two states.

Main Results:

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  • A significant increase in corneal curvature (steepening) was observed during accommodation.
  • Mean K-values increased by approximately 0.6-0.7 diopters in central corneal zones.
  • No significant correlation was found between age and the magnitude of corneal curvature change.

Conclusions:

  • Changes in corneal curvature are a measurable component of accommodation.
  • These findings suggest that corneal topography alterations actively participate in the mechanism of visual accommodation.