Influence of local inhomogeneities induced in corneal ablation on the evolution of contrast sensitivity

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...

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Bibliographic Details
Published inOptics letters Vol. 29; no. 7; p. 739
Main Authors Ortiz, Dolores, Saiz, Jose M, González, Francisco
Format Journal Article
LanguageEnglish
Published United States 01.04.2004
Subjects
Contrast Sensitivity
Cornea - surgery
Humans
Keratomileusis, Laser In Situ - adverse effects
Models, Theoretical
Refraction, Ocular
Refractive Errors - physiopathology
Refractive Surgical Procedures
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Summary: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.
ISSN:0146-9592
DOI:10.1364/ol.29.000739