Lisbon 2017 Delegate Registration Programme Exhibition Virtual Exhibition Satellites OneWorld Travel Discount
escrs app advert

Corneal dioptric power, astigmatism and high order aberrations: a comparison between color light-emiting diode based (Cassini) and Scheimpgflug technology (Pentacam) topographers

Search Title by author or title

Session Details

Session Title: Imaging Anterior Segment

Session Date/Time: Sunday 08/10/2017 | 16:00-18:00

Paper Time: 16:36

Venue: Meeting Center Room I

First Author: : Á.Garcia-Garcia SPAIN

Co Author(s): :    R. Melian   H. Carreras   V. Rodriguez              

Abstract Details


To study the agreement between a color light-emiting diode based (Cassini) and Scheimpflug (Pentacam) based topographers in the evaluation of anterior, posterior and total astigmatism and analyzing high order aberrations and to compare the measures obtained


Eurocanarias Oftalmológica Eye Clinic Calle León y Castillo, 211 35004 Las Palmas de Gran Canaria Spain


30 eyes from 30 healthy patients were consecutively measured using Pentacam and Cassini. The main evaluated parameters were the anterior, posterior and total dioptric power and high order aberrations. The similitudes of the obtained results between both devices had been analyzed through the intraclass correlation coefficient (ICC) and using Bland-Altman plots. The comparison was done using paired Student’s t-test.


The agreement between both devices when comparing the anterior and total corneal dioptric power was very high (ICC>0,85), but not so at the comparison of posterior cornea (ICC<0,5). The agreeement between high order aberrations was limited (ICC<0,4). When studying parameters of the anterior cornea, no statistically significant differences between both topographers were found (p>0,05). But they were found between the posterior and total parameters (p<0,001). Regarding aberrometry, when comparing trefoil no statistically significant differences were found, but, instead, it was obtained when comparing the measures of coma and spherical aberration.


Both devices were highly comparable when studying the anterior face of the cornea, yet the agreement when measuring posterior cornea and high order aberrometry were varied. The data obtained by both topographers are not exchangeable.

Financial Disclosure:


Back to previous