This study reports on 60 eyes of 120 patients who underwent routine cataract surgery followed by implantation of the trifocal IOL model Lisa tri-839MP. This is a diffractive trifocal preloaded IOL with no interruption at the haptic-optic junction, 360 degrees square edged to prevent posterior capsular opacification. All cases are performed by a single surgeon. Inclusion criteria were patients with less than 1.25 dioptres of corneal astigmatism with cataract or clear lens seeking spectacle independence. All patients underwent defocus curve assessment, which is when a sequential series of minus and plus lenses are used to simulate different distances over which a patient’s vision is evaluated. The results showed that at one month postoperatively there was no significant improvement in near and intermediate visual acuities and only distance acuity. Between one month and 12 months there was a progressive improvement in uncorrected intermediate acuity. In the defocus curve no significant differences were found between visual acuities corresponding to defocus levels of -1.0 D and -2.0 D. Ocular aberrations decreased statistically significantly at six to 12 months postoperatively. Four eyes required YAG laser posterior capsulotomy. This particular trifocal combines both a bifocal and trifocal pattern on its posterior surface and maintains effective near intermediate and distance vision at 12 months and associated with good levels of contrast sensitivity and ocular aberrations.
Implantation of diffractive trifocal intraocular lens
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