Validation of ocular aberrometric and keratometric measurements provided by a new diagnostic integrated system in mild-to-moderate keratoconus
Session Details
Session Title: Presented Poster Session: Infection & Imaging
Venue: Poster Village: Pod 2
First Author: : D.Piñero Llorens SPAIN
Co Author(s): : A. Molina-Martin R. Soto-Negro P. Ruiz-Fortes H. Fukumitsu
Abstract Details
Purpose:
To evaluate the intrasession repeatability and validity of corneal curvature measurements provided by a new multifunctional device, and to assess the intrasession repeatability of its ocular aberrometric measures.
Setting:
Department of Ophthalmology of Vithas Medimar International Hospital and Department of Optics, Pharmacology and Anatomy of the University of Alicante, Alicante, Spain
Methods:
Prospective study including 37 mild to moderate keratoconus eyes of 37 patients. In all cases, three repeated measures of corneal topography and ocular aberrometry were performed with the iDesign 2 system (Johnson & Johnson Vision) (iD2), as well as one keratometric measurement with the IOL-Master 500 (Carl Zeiss Meditec) (IOLM) and Sirius (CSO) (SIR) systems. Intrasession repeatability was assessed with the within-subject standard deviation (Sw) and intraclass correlation coefficient (ICC). Interchangeability was evaluated with the Bland & Altman method.
Results:
Sw was <0.50 D for all iD2 keratometric measurements, with ICC>0.980. The Sw and ICC for the keratometric axis were 2.60º and 0.992, respectively. Concerning aberrations, all Sw values for high order Zernike terms were ≤0.11 μm (ICC>0.900), and all Sw values for refraction data were <0.75 D (ICC>0.95), except for J45. No statistically significant differences were found between devices in any keratometric parameter evaluated (p≥0.222), but the limits of agreement between devices were clinically relevant. The magnitude of K readings and astigmatism correlated significantly with the difference in these parameters between iD2 and SIR (0.518≤r≤0.658, p≤0.014).
Conclusions:
The iD2 system provides consistent measures of keratometry and ocular aberrometry in eyes with mild to moderate keratoconus. Keratometric data obtained with this system in these eyes cannot be considered as interchangeable with data provided by IOLM and SIR, except K-readings measured with SIR and iD2 in incipient cases.
Financial Disclosure:
None