Low contrast visual acuity in pseudophakic patients implanted with an anterior surface modified prolate intraocular lens.

Abstract

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 < or = 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.

• Authors: Federico Ricci, Gianluca Scuderi, Filippo Missiroli, Federico Regine, Angelica Cerulli
• Journal: Acta ophthalmologica Scandinavica (Acta Ophthalmol Scand) Vol. 82 Issue 6 Pg. 718-22 (Dec 2004) ISSN: 1395-3907 [Print] Denmark
• PMID: 15606470 (Publication Type: Clinical Trial, Comparative Study, Journal Article, Randomized Controlled Trial)

Topics

• Aged
• Contrast Sensitivity (physiology)
• Female
• Humans
• Lens Implantation, Intraocular
• Lenses, Intraocular
• Male
• Middle Aged
• Phacoemulsification
• Prosthesis Design
• Pseudophakia (physiopathology)
• Visual Acuity (physiology)