Evaluation of image quality after implantation of 2 diffractive multifocal intraocular lens models

Purpose

To compare the visual quality after implantation of multifocal intraocular lenses (IOLs).

Setting

Departments of Ophthalmology, Hospital Quirón and Hospital Clínico San Carlos, Madrid, Spain.

Methods

In a prospective nonrandomized consecutive trial, patients had bilateral implantation of Acri.LISA 366D (Group A) or Tecnis ZM900 (Group B) multifocal IOLs. One eye of each patient was included in the study. Three months postoperatively, uncorrected and corrected distance and near visual acuities, pupil diameter, and refraction were assessed. The modulation transfer function (MTF), point-spread function (PSF), and light scattering were calculated using the double-pass Optical Quality Analysis System for distance vision with a 4.0 mm pupil diameter.

Results

Each IOL group comprised 20 patients. No statistically significant differences were found between the 2 groups in postoperative mean spherical equivalent or mean monocular corrected distance or near visual acuity. The PSF variables were slightly lower in Group B, although the difference between groups was not statistically significant. The MTF parameters (double-pass value at 100%, 20%, and 9% contrast) were slightly higher in Group A (P = .07, P = .04, and P = .09, respectively). The mean objective scatter index was 1.83 ± 0.91 (SD) in Group A and 2.00 ± 0.74 in Group B (P = .43).

Conclusions

Both diffractive multifocal IOLs improved functional visual capacity at distance and near. Although the visual quality variables were slightly better in Group A than in Group B, the differences were not statistically significant.