BACKGROUND AND RATIONALE: Halos are a clinically relevant photic phenomenon associated with presbyopia-correcting intraocular lens (IOL) designs, particularly under mesopic or nighttime conditions. This white paper presents a focused synthesis of optical-bench data characterizing halo phenomena for enVista Envy™, Clareon® PanOptix®, and Tecnis Odyssey™ IOLs.

METHODS: Optical-bench testing used an artificial-eye model with +0.27 µm spherical aberration at a 5.15 mm IOL-plane pupil, warm-white LED illumination (3000 K), and digital image acquisition weighted to photopic spectral efficiency. All IOLs had a 20 D base power. Testing followed ANSI Z80.35-2018 and ISO 11979-2:2024 recommendations. Far-vision halo images were acquired at 3.0 mm and 4.5 mm apertures, representing photopic and mesopic pupil conditions, and halo diameter was estimated in arcminutes from averaged radial intensity profiles.

RESULTS: At the 3.0 mm pupil, all three lenses had broadly similar halo diameters of approximately 20 arcmin. At 4.5 mm, enVista Envy remained approximately 20 arcmin, with a size increase within experimental uncertainty (<1%). PanOptix increased from approximately 21 to 30 arcmin (+9 arcmin; +43%), and Odyssey increased from approximately 20 to 24 arcmin (+4 arcmin; +20%). The authors attributed the pupil-independent halo size of enVista Envy to its apodized diffractive architecture.

CONCLUSION: Under optical-bench conditions emulating mesopic vision, the enVista Envy FVR IOL produced a smaller halo than PanOptix and a smoother halo than Odyssey, with no measurable increase in halo diameter at the larger pupil. These in-vitro findings are mechanistic and should not be used to predict individual patient experience; clinical studies are required to assess effects on visual comfort and quality of life.