AIM: To evaluate and compare the clinical outcomes with a diffractive bifocal and trifocal intraocular lens (IOL) during a 12-month follow-up. METHODS: Prospective comparative study including 75 eyes of 38 patients (44-70y) undergoing uneventful cataract surgery. Each patient was randomly assigned to one type of IOL, bifocal (35 eyes) or trifocal (40 eyes). Visual, refractive, and contrast sensitivity changes were evaluated in a 12-month follow-up. The binocular defocus curve was also measured at 12mo postoperatively. RESULTS: No statistically significant differences between groups were found in postoperative uncorrected and corrected distance visual acuities (P≥0.276). Postoperative corrected near visual acuity (33 cm) was significantly better in the trifocal group during all follow-up (P≤0.004) as well as 6-month uncorrected near (P=0.008) and distance-corrected near visual acuities (P=0.016) (33/40 cm). Significantly better uncorrected intermediate and distance corrected-intermediate visual acuity were found during all follow-up in the trifocal group (P<0.001), which was consistent with differences among groups in binocular defocus curve. Differences among groups in contrast sensitivity were minimal, being only significant at 6 months for some low to medium spatial frequencies (P≤0.006). CONCLUSION: Bifocal and trifocal diffractive IOLs are able to provide an effective visual restoration which is maintained during a 12-month follow-up, with a clear benefit of the trifocal IOL for the intermediate vision.

Eye Clinic of Jessnius Faculty of Medicine Martin 41736 Slovakia

Eye Department of Regional Hospital in Havlickuv Brod Havlickuv Brod 58001 Czech Republic

Premium Clinic Teplice 41501 Czech Republic Department of Optics Pharmacology and Anatomy University of Alicante Alicante 03690 Spain

Premium Clinic Teplice 41501 Czech Republic Eye Department of Regional Hospital in Havlickuv Brod Havlickuv Brod 58001 Czech Republic

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