Anterior Corneal Surface Descriptors, Posterior Elevation and Pachymetric Progression in Normal and Subclinical Keratoconus as Assessed by Pentacam

GALLETTI JONATÁN; DELRIVO MARIANELLA; PFÖRTNER TOMÁS; FUENTES BONTHOUX FERNANDO; GALLETTI JEREMÍAS GASTÓN

Fort Lauderdale, FL

Congreso; ARVO 2012 Annual Meeting; 2012

ARVO

Purpose:To compare corneal shape descriptors of the Pentacam Scheimpflug tomograph in healthy and subclinical keratoconus eyes to assess their diagnostic capacity. Methods:22 eyes from 22 healthy subjects in group 1 and 26 eyes from 26 unilateral manifest keratoconus patients in group 2 were evaluated with corneal topography and Pentacam tomography. The eye with the lowest average corneal power (ACP) was recruited in group 2. Pentacam reported indices for the anterior corneal surface (ISV, IVA, KI, CKI, IHA, IHD and Rmin), relative pachymetric progression from thinnest point at 1, 2, 3, 4 and 5-mm (RelProg1-5), maximum posterior elevation (PElev), Belin?s adjusted posterior elevation (PElevBelin) and normalized Belin-Ambrosio indices (Df, Db, Dp, Dt, Dy and overall D) were compared between groups. Diagnostic capacity was determined by receiver-operating characteristic (ROC) analysis. Results:The two groups were not significantly different in mean age (years, 32.8±13.0 vs 31.5±12.3), central corneal thickness (µm, 510.1±26.9 vs 498.8±34.8) or ACP (diopters, 44.02±1.82 vs 44.58±2.21). All but one anterior corneal surface indices were significantly different (p