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Orientation changes of the main corneal axes as a function of age
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| Abstract |
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| 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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English
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Optometry and vision science. - Baltimore, Md | |
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Baltimore, Md : 2013
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1040-5488
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90:1(2013), p. 23-30
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000313015200013
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