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Contrast sensitivity and defocus curve of multifocal intraocular lenses: comparative study

Poster Details

First Author: R.Freitas PORTUGAL

Co Author(s):    T. Monteiro   N. Franqueira   F. Correia   F. Vaz           

Abstract Details


To compare visual quality, using contrast sensivity (CS) and visual functioning (defocus curve) after implantation of three types of Multifocal Intraocular Lenses (IOL): Tecnis® (+3,25D), ReSTOR® (+3,00D) and AT LISA trifocal® (+3,33D near add e 1,66D intermediate).


Hospital de Braga, Portugal


We evaluated 85 eyes from 45 patients with ages between 45 and 70 years old. There were 2 control groups: one with a monofocal IOL and another without IOL implantation, both within the same age range. Defocus curves from +2,5D to -4,5D were obtained in binocular vision, with distance correction. CS was tested using patterns of vertical sine-wave gratings with 3 distinct inclinations and 6 different spatial frequencies (from 0,75 to 18 c/d) in photopic and mesopic conditions.


No statistically significant differences were observed between visual behaviour of three multifocal IOLs for the dioptric powers between +1,5D to -1,5D, although AT LISA trifocal® showed better visual acuity for the -1,00 and -1,5 D adds. The defocus curve of the monofocal IOL shows a significant decrease of visual function for the -1,5 D or more of near add, compared to any kind of multifocal IOL. The ReSTOR IOL shows the best outcome for the -4,00 and -4,50 D add. The AT LISA trifocal® IOL showed statistically superior CS values than the Tecnis® and ReSTOR® IOL in low spatial frequencies (0,75- 3 c/d) in both light conditions, and similiar results as the monofocal IOL in both mesopic and photopic conditions.


The AT LISA trifocal® IOL provides better visual acuity at intermediate distances than the classic bifocal IOLs and shows the smallest contrast sensivity loss of all multifocal IOLs studied, providing similar results as a monofocal IOL for low spacial frequencies.

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