Rasterstereography-based classification of normal corneas.
OBJECTIVE
To attempt to classify the topographic patterns identified by rasterstereography in a population with normal corneas.


METHODS
Tulane Medical Center Clinic, New Orleans, Louisiana.


METHODS
Corneal elevation pictures of 100 eyes of 50 volunteers were taken using the PAR Corneal Topography System. The volunteers had no history of eye injury, disease, or surgery, and none wore contact lenses. Three observers independently assigned the images to one of five subgroups.


RESULTS
Five categories were identified: unclassified, regular ridge, irregular ridge, incomplete ridge, and island. There were significant statistical differences in the degree of astigmatism between the irregular ridge and incomplete ridge groups (P = .0419) and between the irregular ridge and island groups (P = .017).


CONCLUSIONS
The topographic patterns identified by rasterstereography in normal corneas can be classified into five distinct groups.
Naufal
S C
SC
Department of Ophthalmology, Tulane Medical Center, New Orleans, Louisiana 70112, USA.
Hess
J S
JS
Friedlander
M H
MH
Granet
N S
NS
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003315:Cornea / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000145:classification* / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012016:Reference Values