4 documents found, page 1 of 1
Linear fitting of biconic surfaces for corneal modeling
Blanco-Martínez, Iñaki; González-Méijome, José Manuel; Faria Ribeiro, MiguelThis paper presents a method for reconstructing the corneal surface. The proposed method was tested in 56 healthy and 15 post-orthokeratology corneas. The Medmont E300 Corneal Topographer was used to measure the anterior corneal elevation, and custom MATLAB scripts were employed for data analysis, fitting, and other computational processes. The results obtained were compared with the fitting to an ellipsoid and...
Statistical model of ocular wavefronts with accommodation
Mechó-García, María; Arcas-Carbonell, María; Orduna-Hospital, Elvira; Sánchez-Cano, Ana; López-Gil, Norberto; Macedo-De-Araújo, Rute J.PURPOSE. The purpose of this study was to determine the minimum number of orthonormal basis functions, applying Principal Component Analysis (PCA), to represent the most wavefront aberrations at different accommodation stages. The study also aims to generate synthetic wavefront data using these functions. METHODS. Monocular wavefront data from 191 subjects (26.15 ± 5.56 years old) were measured with a Hartmann-...
Optical characterization and through-focus performance of two advanced monofoca...
Faria Ribeiro, Miguel; González-Méijome, José Manuel; Borges, Anabela; Ferreira, Isabel; Salgado‑Borges, JoséPurpose To compare the refractive power profle, subjective depth-of-feld and objective optical quality of two advanced monofocal intraocular lenses (IOLs) designed to improve intermediate vision. Methods This prospective study evaluated forty-six eyes of twenty-three patients, aged 54–68 years, binocularly implanted with two monofocal enhanced intraocular lenses (IOLs), the Tecnis Eyhance and the Physiol Isopur...
Letter to the editor
Faria Ribeiro, Miguel[Excerpt] Recently, Alió and co-works published a study [1] comparing the clinical optical image quality of patients following implantation with different intraocular lenses (IOLs), based on the analysis of the wavefront measured with a pyramidal wavefront sensor-based aberrometer. A set of nine groups of patients was evaluated, including patients implanted with two diffractive trifocals. Surprisingly, accordin...