Purpose:To determine the reproducibility of indices for diagnosis and follow-up of keratoconus measured with Rotating Scheimpflug Camera imaging system (Pentacam). Methods:Three consecutive scans, taken by the same operator, at a 5 minute interval each, were randomly taken on one eye of 14 patients with keratoconus using Pentacam. The parameters taken into evaluation were: corneal volume (CV), maximal keratometry value (K max), radii of curvature (Rh, Rv) and mean keratometry (Rm) of front (CF) and back (CB) cornea, thinnest location (TL), x (X) and y (Y) position of TL, anterior (ACE) and posterior corneal elevation (PCE) of TL.Reproducibility was assessed by calculating percentage coefficient of variation (%CoV) for all parameters except X and Y for which standard deviation (SD) was considered. The effect of mean value on %CoV was tested by regression analysis and their association with R2. Results:Results are shown in Table 1. %CoVs were <2% in all parameters except ACE and PCE (about 5% each). SD was 0.05 for X and 0.31 for Y. Regression analysis was negative and R2 negligible for all parameters except for RmCF (y= -0,2811x +2,3185, P=0.007, R2=0.47) Conclusions:Pentacam %CoVs in patients with keratoconus were low and independent from mean values (except RmCF). Values outside these ranges should be considered suspect for progression of the disease.

Reproducibility of rotating Scheimpflug camera imaging system in patients with keratoconus / B. Sala, P. Fogagnolo, M. Diguini, L. Ottobelli, L. Rossetti. - In: INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE. - ISSN 0146-0404. - 53:E-Abstract 130(2012). ((Intervento presentato al convegno ARVO Annual Meeting tenutosi a Fort Lauderdale nel 2012.

Reproducibility of rotating Scheimpflug camera imaging system in patients with keratoconus

B. Sala
Primo
;
P. Fogagnolo
Secondo
;
L. Rossetti
Ultimo
2012

Abstract

Purpose:To determine the reproducibility of indices for diagnosis and follow-up of keratoconus measured with Rotating Scheimpflug Camera imaging system (Pentacam). Methods:Three consecutive scans, taken by the same operator, at a 5 minute interval each, were randomly taken on one eye of 14 patients with keratoconus using Pentacam. The parameters taken into evaluation were: corneal volume (CV), maximal keratometry value (K max), radii of curvature (Rh, Rv) and mean keratometry (Rm) of front (CF) and back (CB) cornea, thinnest location (TL), x (X) and y (Y) position of TL, anterior (ACE) and posterior corneal elevation (PCE) of TL.Reproducibility was assessed by calculating percentage coefficient of variation (%CoV) for all parameters except X and Y for which standard deviation (SD) was considered. The effect of mean value on %CoV was tested by regression analysis and their association with R2. Results:Results are shown in Table 1. %CoVs were <2% in all parameters except ACE and PCE (about 5% each). SD was 0.05 for X and 0.31 for Y. Regression analysis was negative and R2 negligible for all parameters except for RmCF (y= -0,2811x +2,3185, P=0.007, R2=0.47) Conclusions:Pentacam %CoVs in patients with keratoconus were low and independent from mean values (except RmCF). Values outside these ranges should be considered suspect for progression of the disease.
keratoconus ; imaging/image analysis: clinical
Settore MED/30 - Malattie Apparato Visivo
2012
Association for Research in Vision and Ophthalmology
http://abstracts.iovs.org/cgi/content/abstract/53/6/130
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/207341
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