Person:
Alonso Fernández, José

Profile Picture
First Name
José
Last Name
Alonso Fernández
URI
https://hdl.handle.net/20.500.14352/79966
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Óptica
Area
Optica
Identifiers
UCM identifierORCIDScopus Author IDDialnet ID

Filters

1998 - 199912020 - 20231
Reset filters

Settings

Author: Alonso Fernández, José × Subject: 535.316/.317 ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    A generalization of Prentice's law for lenses with arbitrary refracting surfaces
    (Ophthalmic & Physiological Optics (OPO), 1998) Canabal Boutureira, Héctor Alfonso; Gómez Pedrero, José Antonio; Alonso Fernández, José; Bernabéu Martínez, Eusebio
    A generalization of the Prentice's law is presented in this paper. The idea consists of removing some (but not all) of the approximations that comprise the paraxial approach. In that way, we obtain a new formulation that permits us to compute the prismatic power of a lens made up of arbitrary refracting surfaces, and to improve the precision obtained by Prentice's law when applied to monofocal lenses. The resulting formalism is simple and manageable and its derivation leads us to a precise definition of the local dioptric power matrix, introduced in a previous paper, as well as a better understanding of the same.
  • Thumbnail Image
    Item
    Evaluation of an Eye-Tracking-Based Method for Assessing the Visual Performance with Progressive Lens Designs
    (Applied Sciences, 2023) Concepción Grande, Pablo; Chamorro Gutiérrez, Eva; Cleva Millor, José Miguel; Alonso Fernández, José; Gómez Pedrero, José Antonio
    Due to the lack of sensitivity of visual acuity (VA) measurement to quantify differences in visual performance between progressive power lenses (PPLs), in this study, we propose and evaluate an eye-tracking-based method to assess visual performance when wearing PPLs. A wearable eye-tracker system (Tobii-Pro Glasses 3) recorded the pupil position of 27 PPL users at near and distance vision during a VA test while wearing three PPL designs: a PPL for general use (PPL-Balance), a PPL optimized for near vision (PPL-Near), and a PPL optimized for distance vision (PPL-Distance). The participants were asked to recognize eye charts at both near and distance vision using centered and oblique gaze directions with each PPL design. The results showed no statistically significant differences between PPLs for VA. However, significant differences in eye-tracking parameters were observed between PPLs. Furthermore, PPL-Distance had a lower test duration, complete fixation time, and number of fixations at distance evaluation. PPL-Near has a lower test duration, complete fixation time, and number of fixations for near vision. In conclusion, the quality of vision with PPLs can be better characterized by incorporating eye movement parameters than the traditional evaluation method.