Wavefront analysis and modulation transfer function of three multifocal intraocular lenses.
OBJECTIVE
To evaluate wavefront performance and modulation transfer function (MTF) in the human eye after the implantation of diffractive or refractive multifocal intraocular lenses (IOLs).


METHODS
This was a prospective, interventional, comparative, nonrandomized clinical study. Uncorrected distance and near visual acuity, and wavefront analysis including MTF curves (iTrace aberrometer, Tracey Technologies, Houston, TX, USA) were measured in 60 patients after bilateral IOL implantation with 6 months of follow-up. Forty eyes received the diffractive ReSTOR (Alcon), 40 eyes received the refractive ReZoom (Advanced Medical Optics) and 40 eyes, the Tecnis ZM900 (Advanced Medical Optics). The comparison of MTF and aberration between the intraocular lenses was performed using analysis of variance (ANOVA), followed by the Dunn test when necessary.


RESULTS
The mean uncorrected distance visual acuity was similar in all three groups of multifocal IOLs. The ReSTOR group provided better uncorrected near visual acuity than the ReZoom group (P<0.001), but similar to the Tecnis group. Spherical aberration was significantly higher in the ReZoom group (P=0.007). Similar MTF curves were found for the aspheric multifocal IOL Tecnis and the spheric multifocal IOL ReSTOR, and both performed better than the multifocal IOL ReZoom in a 5 mm pupil (P<0.001 at all spatial frequencies).


CONCLUSIONS
Diffractive IOLs studied presented similar MTF curves for a 5 mm pupil diameter. Both diffractive IOLs showed similar spherical aberration, which was significantly better with the full-diffractive IOL Tecnis than with the refractive IOL ReZoom.
Santhiago
Marcony R
MR
Department of Cataract Surgery and Refractive Surgery, University of São Paulo, São Paulo, Brazil.
Netto
Marcelo V
MV
Barreto
Jackson
J
Gomes
Beatriz A F
BA
Schaefer
Arthur
A
Kara-Junior
Newton
N
D057128:Aberrometry; D002387:Cataract Extraction; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D055620:Optical Phenomena; D014792:Visual Acuity