Comparison of clinical outcomes, visual quality and visual function of two presbyopia-correcting intraocular lenses made from the same material, but with different design and optics

Abstract: This semi-prospective, parallel, comparative investigation tested the clinical outcomes and the quality of vision (contrast sensitivity, visual function, dysphotopsia, spectacle use, overall satisfaction) after the mono- or bilateral implantation of one of two presbyopia-correcting intraoc-ular lenses (Liberty® 677MY or AT LISA® tri 839M) in 50 eyes of 28 cataract patients. Clinical outcomes were assessed three and twelve months postoperatively. Eighty-nine percent of the Lib-erty eyes, while 59% of AT LISA tri eyes resulted within 0.5 diopters from the target refraction, emmetropia. Refractive outcomes were stable with both lenses. A higher proportion of the Liberty eyes could achieve an uncorrected distance and an uncorrected near visual acuity of 20/20 (UDVA: 56% vs. 41%; UNVA: 83% vs. 66%). Optical quality assessment results were comparable for the two IOLs. Superior photopic contrast sensitivity was found with the Liberty lens. 16.7% of the Liberty, while 40.6% of the AT LISA tri eyes required Nd:YAG capsulotomy during the first postoperative year. As both lenses are made from the same material, we suppose that the differences in clinical outcomes and the distinct frequency and severity of posterior capsule opacification might derive from the different design and optical surface of the two examined lenses.