The Role of Pentacam in Assessment of Keratoconus

detection the prevalence of keratoconus among candidates of refractive surgery who showed normal pattern of corneal topography and to assess the role of pentacam in evaluation of alteration of keratometric, pachymetric and elevation parameters in keratoconic and normal myopic eyes. METHODS: 250 eyes in two group keratoconus group and control group, All eyes were examined with the Pentacam HR and The following data were recorded: keratometry values in the flat (K1) and steep (K2) meridian, corneal astigmatism (cylinder), corneal thickness at the center (central pachymetry) and at the thinnest point of the cornea (minimal pachymetry), the distance of the thinnest point of the cornea (apex of the cone in keratoconic patients) from the center of the cornea in the vertical meridian (y), and local elevation (anterior elevation, posterior elevation) values RESULTS: Statistical analyses were performed and All parameters revealed statistically significant difference between the 2 groups (P 0.001), Receiver operating characteristic (ROC) showed that Posterior elevation had the highest sensitivity and specificity with area under the curve (0.99) a cutoff point of 19.5μm was found to have the highest sensitivity and specificity. In the control group we had 3 cases topographically free but showed posterior elevation by Pentacam maps with remaining cases were completely free. CONCLUSIONS: posterior and anterior elevation and minimal pachymetry results seem to be effective indices in the diagnosis and follow up of keratoconic patients.