TY  - JOUR
A1  - ,  
T1  - Anatomic differences between a normal and two keratoconus corneas
JO  - Eur. J. Anat.
SN  - 1136-4890
Y1  - 2007
VL  - 11
SP  - 31
EP  - 35
UR  - http://www.eurjanat.com/web/paper.php?id=07010031
KW  - adult
KW  - article
KW  - case report
KW  - cornea thickness
KW  - device
KW  - excimer laser
KW  - female
KW  - human
KW  - keratoconus
KW  - laser surgery
KW  - male
KW  - preoperative evaluation
KW  - refractive surgery
N2  - Keratoconus is an anatomic deformity of the cornea characterized by progressive thinning and a cone-shaped protrusion of the central cornea. Thinning corneal disorders, such as keratoconus, should be identified before excimer laser refractive surgery. An Orbscan System (Orbscan Corneal Topography System II, Orbscan Inc., Salt Lake City, UT, USA) was used to analyse and compare corneal thickness values and the anterior and posterior corneal elevation maps of three subjects who wished to undergo excimer laser refractive surgery. The quantitative differences between the minimum thickness value of the entire cornea and the values obtained in the central and paracentral cornea of the subjects were also analysed. Analysis of corneal thicknessess revealed that normal corneas had higher central and paracentral values. Greater differences were found between the thinnest site of the entire cornea and the paracentral areas in the keratoconic corneas than in the normal cornea. The cone-shaped protrusion was detected in the anterior and posterior corneal elevation maps of one subject but only in the posterior elevation map of the other keratoconus subject. The detection of corneal anatomic deformities, such as keratoconus, should include the analysis of corneal thickness values and the analysis of both anterior and posterior corneal elevation maps.
ER  -