Open AccessLow contrast visual acuity in pseudophakic patients implanted with an anterior surface modified prolate intraocular lens
Author(s) -
Ricci Federico,
Scuderi Gianluca,
Missiroli Filippo,
Regine Federico,
Cerulli Angelica
Publication year - 2004
Publication title -
acta ophthalmologica scandinavica
Language(s) - English
Resource type - Journals
eISSN - 1600-0420
pISSN - 1395-3907
DOI - 10.1111/j.1600-0420.2004.00355.x
Subject(s) - medicine , photopic vision , prolate spheroid , contrast (vision) , ophthalmology , intraocular lens , mydriasis , pupillary response , visual acuity , pupil , cataracts , optometry , optics , retinal , mathematics , mathematical analysis , physics
. Purpose: To determine whether implantation of a new intraocular lens (IOL) with a modified prolate anterior surface, designed to reduce the positive spherical aberration of the pseudophakic eyes, results in improved contrast sensitivity assessed in terms of low contrast visual acuity (VA).Methods: We carried out an intraindividual study of 12 patients with bilateral cataracts, randomized to receive a prolate anterior surface IOL (Tecnis Z9000, Pharmacia) in one eye and a biconvex spherical surface IOL (CeeOn 911 A, Pharmacia) in the other. High and low contrast VA was assessed under photopic conditions, before and after pupil dilation.Results: After mydriasis, the Technis Z9000 provided significantly better low contrast VA at contrast levels ≤ 25%. No significant difference was found under normal pupil conditions.Conclusion: Our results confirm the hypothesis that the spherical aberration of the eye after cataract surgery can be reduced by an anterior prolate surface IOL.