Visual Quality With An Extended Vision Intraocular Lens Under Mesopic Conditions

To assess the visual function in patients with a non-diffractive extended vision intraocular lens (IOL) under mesopic conditions.

Clínica Rementería, Madrid, Spain.

This descriptive study with bilaterally implanted with the Vivity or the Vivity Toric IOL and analyzed their visual function three months after the surgery. Uncorrected and corrected distance visual acuity (UDVA) was measured at the distance vergences of -2.5, -1.5, -1.0, -0.50, 0.0, +0.50, +1.0 D. Contrast sensitivity function (CSF) was measured at spatial frequencies of 3, 6, 12 and 18 cycles per degree (cpd). All measurements were made monocularly under mesopic conditions (3cd/m²). Finally, patients fulfilled questions related to the presence of halos and glare during night conditions.

A total of 39 eyes of 39 patients were included. UDVA was 0.00 ± 0.06 logMAR. CDVA was < 0.1 logMAR (0.8 decimal) between +0.5 and -1.0D of vergence. At -0.5D and +0.5D of vergence, CDVA remained unchanged or decreased ≤ 1 line of vision for the 85% and 44% of patients, respectively. Mean CSF values were within normal ranges for healthy patients. For the questions related night conditions and perceived halos 47% reported to “never” perceive halos, 25% “very little”, 19% “sometimes” and 6% “always”. For the glare during night conditions, 41% reported to “never” perceive glare, 34% “very little”, 16% “sometimes” and 6% “always”.   

Patients achieved good visual outcomes from far to intermediate distances. The VA decreased from -1.5D of vergences but showed to be robust for simulated low myopic errors. On the contrary, the VA decreased significantly for simulated residual hyperopic errors. In conclusion, patients showed satisfactory clinical outcomes from far to intermediate distances with the extended vision IOL under study for mesopic conditions.