title: Influence of local inhomogeneities induced in corneal ablation on the evolution of contrast sensitivity.
abstract: The presence of local inhomogeneities in corneal tissue after refractive surgery has an influence on visual performance. Here we focus on the corneal ablation associated with Lasik surgery and its effect on the modulation transfer function (MTF) that we obtained by modifying a personalized Kooijman model. Inhomogeneities induced by the ablation occur in the form of Gaussian-distributed refractive-index variations of a given correlation length. We show how variation of refractive-index deviation and correlation length (size) of the inhomogeneities allows us to obtain pairs of values that are able to achieve a MTF evolution similar to that observed for contrast sensitivity in the same patients. An estimate of the characteristics of the local effects is obtained.
authors.affiliation: Grupo de Optica, Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Cantabria, Avenada de los Castros s/n, 39005 Santander, Spain.
authors.forename: Dolores
authors.initials: D
authors.lastname: Ortiz
authors.forename: Jose M
authors.initials: JM
authors.lastname: Saiz
authors.forename: Francisco
authors.initials: F
authors.lastname: González
mesh_terms: D015350:Contrast Sensitivity; D003315:Cornea / Q000601:surgery*; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000009:adverse effects*; D008962:Models, Theoretical; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000503:physiopathology*; D054140:Refractive Surgical Procedures