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Change in objectively determined forward light scatter with the apposition of a soft contact lens

Poster Details

First Author: A.Calvo-Maroto SPAIN

Co Author(s):    R. Perez-Cambrodi   J. Esteve-Taboada   D. Madrid-Costa   A. Cervino           

Abstract Details


To objectively evaluate the change in intraocular forward light scatter before and after the fitting of a soft contact lenses and determine the usefulness of the technique for assessing change in optical performance after ocular intervention.


University of Valencia, Spain


Nine healthy subjects (18 eyes) were included in this study. The raw Hartmann-Shack patterns were obtained using a commercially available Hartman-Shack autorrefractometer-keratometer (L-79 ARK; Luneau Tech. SAS, France) before and after fitting a soft contact lens wear. Custom-made image analysis software developed and used in previous studies was used to obtain objective measures of intraocular light scatter. Values of scatter were represented as the maximum standard deviation within a lenslet for all lenslets in the Hartmann-Shack pattern (Max_SD), as described by Donnelly and Applegate in 2004.


Max_SD obtained in healthy subjects without contact lens wear was significantly higher (31.202 ± 3.935) than with contact lens wear (27.979 ± 7.472) (p=0.035).


Apposition of a therapeutic contact lens increases intraocular light scatter, therefore reducing optical quality. In vivo determination of intraocular light scatter objectively from the analysis of Hartmann-Shack patterns is useful for determining changes in optical performance of the eye after intervention.

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