|
Title
|
|
|
|
Orientation changes of the main corneal axes as a function of age
| |
|
Author
|
|
|
|
| |
|
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) |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Optometry and vision science. - Baltimore, Md
| |
|
Publication
|
|
|
|
Baltimore, Md
:
2013
| |
|
ISSN
|
|
|
|
1040-5488
| |
|
DOI
|
|
|
|
10.1097/OPX.0B013E3182780F88
| |
|
Volume/pages
|
|
|
|
90
:1
(2013)
, p. 23-30
| |
|
ISI
|
|
|
|
000313015200013
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|