Format

Send to

Choose Destination
See comment in PubMed Commons below
J Cataract Refract Surg. 2003 Jul;29(7):1297-301.

Changes in corneal curvature in accommodation.

Author information

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

Abstract

PURPOSE:

To determine the changes in corneal curvature in accommodation.

SETTING:

Department of Ophthalmology, St. Luke's International Hospital, Tokyo, Japan.

METHODS:

Twenty-eight eyes of 14 healthy volunteers with a mean age of 38.9 years (range 28 to 65 years) were enrolled in this prospective study. Corneal topographies were taken before and during accommodation. Subjects achieved maximal accommodation by gazing at a target letter "A" in front of the eye. Keratometric values (K-values) obtained by topographies before and during accommodation were compared.

RESULTS:

Steepened corneal curvatures during accommodation were observed with the difference-plot view. Maximum K-values for the central 3.0 mm, 5.0 mm, and 7.0 mm corneal diameters significantly increased by a mean of 0.62 diopters (D) +/- 0.83 (SD) (P =.0005, paired t test), 0.60 +/- 0.90 D (P =.0015), and 0.72 +/- 0.65 D (P<.0001), respectively. Respective minimum K-values significantly increased by a mean of 0.62 +/- 0.83 D (P=.0005), 0.67 +/- 0.68 D (P<.0001), and 0.64 +/- 0.62 D (P<.0001). No statistically significant relationship was found between age and change in K-values.

CONCLUSION:

The results suggest that changes in corneal curvature in accommodation participate in the mechanism of accommodation.

Comment in

PMID:
12900235
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center