PURPOSE: To analyze in-vitro the features of the halo produced by a new Full Range of Vision (FRoV) intraocular lens (IOL) and compare it with two well-known designs.

METHODS: The halo formed in distance vision by the new FRoV IOL (enVista Envy, Bausch + Lomb) was imaged using a 3.44 arcmin pinhole test in an ISO model eye (ISO 11979-2:2014, model eye 2) with white light, per ANSI Z80.35-2018 guidelines. The setup simulates viewing a car headlight (20 cm) at 200 meters. The cornea's spherical aberration was +0.27 μm (5.15 mm pupil at the IOL plane). Halos from two established designs, AcrySof PanOptix (Alcon) and Tecnis Synergy (J&J), were assessed for comparison. Halo size and energy were measured with 20.0 D lenses using 3.0- and 4.5-mm apertures at the IOL plane.

RESULTS: The Envy IOL produces with both pupils a smooth halo whose size does not increase significatively with pupil (from 20.2±0.5 arcmin to 20.6±0.5 arcmin with 3.0- and 4.5 mm pupils, respectively) due to the apodised design of this lens. In stark contrast, the trifocal diffractive PanOptix IOL exhibits the largest halo size variation (from 20.9±0.5 arcmin to 30.5±0.5 arcmin with 3.0- and 4.5 mm pupils, respectively). Synergy forms a two-ring shape halo whose size has smaller dependence on the pupil size than PanOptix, but comparable to Envy (20.1±0.5 and 21.1±0.5 arcmin with 3.0- and 4.5 mm pupils, respectively). Regarding halo relative intensity, all three IOLs spoil comparable amounts of energy into the halo, representing over 50% of the total energy with the larger pupil. The effect of the apodization is evident with the Envy design, as it maintains a similar intensity profiles across both pupil sizes. Synergy IOL's behavior looks alike. In contrast, PanOptix spreads energy onto a larger halo with the large pupil compared to the small one.

CONCLUSIONS: The halo of the FRoV Envy IOL has been analyzed and compared to other two trifocal diffractive IOLs. Under light conditions emulating mesopic vision, the new FRoV IOL produces smaller and smoother halos than PanOptix and Synergy respectively. Clinical studies are necessary to further confirm this result.