Achromatic And Chromatic Contrast Sensitivity Outcomes With Two Modalities Of Trifocal Intraocular Lenses: A Randomized Clinical Trial

To compare the achromatic and chromatic contrast sensitivity outcomes in patients implanted with two modalities of trifocal intraocular lenses (IOLs).

Department of Ophthalmology, Vithas Medimar International Hospital, Alicante, Spain

Randomised clinical trial enrolling 40 subjects (age, 47-75 years) undergoing cataract surgery with implantation of one of two trifocal diffractive IOLs: Finevision POD F (PhysIOL, Liège, Belgium) (Group FV, 30 eyes) and RayOne (Rayner Intraocular Lenses, Ltd.,Worthing, UK) (Group RO, 30 eyes). Near (40 cm) achromatic and chromatic contrast sensitivity (CS) was evaluated at 1 month after surgery using the previously validated OptoPad CSF system (University of Alicante).

No significant differences were found between groups in postoperative visual and refractive outcomes (p≥0.380). Regarding achromatic near CS, no significant differences were found between groups (p≥0.080). In contrast, near CS for the red-green mechanism was higher in magnitude in RO compared to FV group, although the differences only reached statistical significance for 8 (1.33±0.14 vs. 1.57±0.32, p=0.033) and 12 cycles/degree (1.21±0.08 vs. 1.32±0.17, p=0.023). The same trend was observed for the near CS measured for the blue-yellow mechanism, only reaching statistical significance differences for 12 cycles/º (0.05±0.02 vs. 0.10±0.07, p=0.047).

The two trifocal IOLs evaluated in the current study provides excellent achromatic CS outcomes at near, but some differences can be present in color sensitivity. Differences in the diffractive designs of the IOL may be related to this finding that should be investigated further.