Piñero, David P., Camps, Vicente J., Caravaca Arens, Esteban, Fez Saiz, Dolores de, Blanes Mompó, Francisco J. Algorithm for Correcting the Keratometric Error in the Estimation of the Corneal Power in Keratoconus Eyes after Accelerated Corneal Collagen Crosslinking Journal of Ophthalmology. Volume 2017 (2017), Article ID 8529489, 8 pages. doi:10.1155/2017/8529489 URI: http://hdl.handle.net/10045/70330 DOI: 10.1155/2017/8529489 ISSN: 2090-004X (Print) Abstract: Purpose. To analyze the errors associated to corneal power calculation using the keratometric approach in keratoconus eyes after accelerated corneal collagen crosslinking (CXL) surgery and to obtain a model for the estimation of an adjusted corneal refractive index (nkadj) minimizing such errors. Methods. Potential differences (ΔPc) among keratometric (Pk) and Gaussian corneal power (PGauss c ) were simulated. Three algorithms based on the use of nkadj for the estimation of an adjusted keratometric corneal power (Pkadj) were developed. The agreement between Pk(1.3375) (keratometric power using the keratometric index of 1.3375), PGauss c , and Pkadj was evaluated. The validity of the algorithm developed was investigated in 21 keratoconus eyes undergoing accelerated CXL. Results. Pk(1.3375) overestimated corneal power between 0.3 and 3.2D in theoretical simulations and between 0.8 and 2.9D in the clinical study (ΔPc). Three linear equations were defined for nkadj to be used for different ranges of r1c. In the clinical study, differences between Pkadj and PGauss c did not exceed ±0.8D nk = 1.3375. No statistically significant differences were found between Pkadj and PGauss c (p > 0 05) and Pk(1.3375) and Pkadj (p < 0 001). Conclusions. The use of the keratometric approach in keratoconus eyes after accelerated CXL can lead to significant clinical errors. These errors can be minimized with an adjusted keratometric approach. Keywords:Keratometric error, Corneal power calculation, Keratoconus eyes, Accelerated corneal collagen crosslinking Hindawi Publishing Corporation info:eu-repo/semantics/article