To evaluate the corneal densitometry in treatment- naive patients with keratoconus and its relevance with anterior and posterior corneal elevation

Keratoconic corneas were examined using the Pentacam. Corneal densitometry was measured over a 12 - mm diameter area, divided by annular concentric zones and depths, more over anterior and posterior corneal elevation was measured. Keratoconus was classified according to the topographic keratoconus classif

There were significant differences in corneal densitometry values of the groups in central 2 mm keratoconus ( KC) = 19.6 gray scale unit ( GSU), and in anulus of 2 to 6mm in diameter When densitometry values for different depths were examined, the anterior layer presented the highest value which was significantly higher than the values obtained in the central and posterior layer.Analysis of the correlation between corneal densitometry for each layer depth with posterior corneal elevation values demonstrated significant association The similar correlation was not found between corneal densitometry for each layer depth and anterior corneal elevation. In the control patients such a significant correlation between posterior / anterior corneal elevation and corneal light backscatter for each layer depth was not found

The densitometry map reveals that light backscatter was higher in the central portion of the anterior keratoconic cornea. Corneal densitometry values of keratoconus patients were correlated with posterior corneal elevation in 0-2, 6-10 and 10-12 annuli and in all anterior, central and posterior layers