Clinical evaluation of a multifocal aspheric diffractive intraocular lens

Aim To evaluate the performance of an aspheric diffractive multifocal acrylic intraocular lens (IOL), ZMB00 1-Piece Tecnis. Setting Five sites across Europe. Methods Fifty-two patients with cataracts (average age 68.510.5years, 35 female) were bilaterally implanted with the aspheric diffractive multifocal IOL after completing a questionnaire regarding their optical visual symptoms, use of visual correction and their visual satisfaction. The questionnaire was completed again 4-6months after surgery along with measures of uncorrected and best-corrected distance and near visual acuity, under photopic and mesopic lighting, reading ability, defocus curve testing and ocular examination for adverse events. Results The residual refractive error was 0.01 +/- 0.47D with 56% of eyes within +/- 0.25D and 97% within +/- 1.0D. Uncorrected visual acuity was 0.02 +/- 0.10logMAR at distance and 0.15 +/- 0.30 logMAR at near, only reducing to 0.07 +/- 0.10logMAR at distance and 0.21 +/- 0.25logMAR at near in mesopic conditions.The defocus curve showed a near addition between 2.5-3.0 D allowing a reading acuity of 0.08 +/- 0.13 logMAR, with a range of clear vision <0.3 logMAR of approximate to 4.0D. The average reading speed was 121.4 +/- 30.8 words per minute. Spectacle independence was 100% for distance and 88% for near, with high levels of satisfaction reported. Overall rating of vision without glasses could be explained (r=0.760) by preoperative best-corrected distance acuity, postoperative reading acuity and postoperative uncorrected distance acuity in photopic conditions (p<0.001). Only two minor adverse events occurred. Conclusions The ZMB00 1-Piece Tecnis multifocal IOL provides a good visual outcome at distance and near with minimal adverse effects.