Title
Orientation changes of the main corneal axes as a function of age Orientation changes of the main corneal axes as a function of age
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
Baltimore, Md ,
Subject
Human medicine
Source (journal)
Optometry and vision science. - Baltimore, Md
Volume/pages
90(2013) :1 , p. 23-30
ISSN
1040-5488
ISI
000313015200013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Purpose. The purpose of this study was to assess the orientation of the anterior and posterior corneal surfaces with respect to the keratometric axis in the three-dimensional space. Methods. A group of 407 normal corneas of 211 subjects with ages ranging from 4 to 79 years was analyzed by fitting their elevation topographies to a general three-axes ellipsoid model. Results. The resulting average tilt (-1.20 degrees) and tip (1.83 degrees) of the anterior surface are consistent with previous findings. In addition, we found that the posterior surface is also misaligned with the anterior by a similar amount. The cornea seems to rotate as a solid body by 2 minutes of arc per year. Conclusions. The misalignment between the cornea and the keratometric axis increases as a function of age. This tiny, but significant (p < 0.005), rotation may have an important impact on optical quality because it could cause an important increase of the higher order aberrations of the cornea with age. (Optom Vis Sci 2013;90:23-30)
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