Optical And Visual Quality In Patients Implanted With A Bi-Aspheric Diffractive Trifocal Or A Bi-Aspheric Non-Diffractive Phasering-Based Edof Intraocular Lens

The aim of this study is to analyze and compare the visual performance of patients with bilateral implantation of a trifocal intraocular lens (IOL) or a novel extended depth-of-focus (EDoF) IOL. 

Clínica Rementería, Madrid, Spain.

Patients having bilateral implantation of the diffractive Asqelio® Trifocal or the non-diffractive Asquelio® EDOF IOL were considered for the study. Three months after the surgery patients underwent: monocular/binocular and uncorrected/corrected distance visual acuity (VA), monocular VA at different contrast (100, 50 and 10%) and binocular defocus curves. Subjective halo perception with an halometer (discrimination index) was evaluated, and patients also completed a five points Likert scale questionnaire reporting about perceived dysphotopsias after the surgery.

This preliminary analysis included 34 eyes (22 with the trifocal and 12 with the EDoF IOL) of 17 patients. Both groups achieved corrected/uncorrected monocular/binocular distance VA values of around 0.0 logMAR (1.0 decimal) with no significant differences between them (p>0.05 for all cases). Defocus curves showed better VA values from -1.5D to near distances (p<0.05 at all vergences) with trifocals. VA at 100, 50 and 10% of contrast showed no difference between both groups. The halo effect (discrimination index) was similar for both groups (p=0.45). While 35% of patients with trifocal lenses reported the presence of halos 'always' or 'moderately', all patients with EDoF IOL reported “never” or “a little. 

Despite a larger sample will reinforce the results, this analysis suggests that both IOLs offer an effective visual restoration to patients at far and intermediate distance, being the trifocal IOL the one with better VA at near distances. On the other hand, the EDoF design exhibited reduced photic phenomena after the surgery.