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Asian Journal of Physics Vol 31, No 7 (2022) 663-675

Halo in extended depth of focus and bifocal intraocular lenses

F Vega, J A Azor and Maria S Millán
Departament d’Òptica i Optometria, Universitat Politècnica de Catalunya,
BARCELONA TECH. Terrassa, Spain

Dedicated to Prof Maria J Yzuel

This work aims to evaluate the size and intensity of the halos generated in distance vision by bifocal and extended depth of focus (EDOF) intraocular lenses (IOLs) as a function of pupil size, lens base power and lens addition. To this end, an EDOF-IOL (Tecnis® Symfony ZXR00) and three bifocal IOLs (Tecnis ® + 4.00 diopter (D) ZMB00, + 3.25 D ZLB00 and +2.75D ZKB00) of the same material and asphericity, were tested in-vitro in a model eye. The size and intensity of the halos formed in the distance focus were experimentally obtained and measured using image analysis. Geometrical optics was used to theoretically estimate the halo size. We obtained the following results: The experimental halo size in the distance focus agreed with the theoretical estimation and was directly proportional to the pupil size and lens add power, and inversely proportional to eye power (cornea plus IOL power). As for the halo intensity, the larger the halo size, the dimmer it was. The EDOF IOL, with the lowest add power, had the smallest size but brightest halo. Concerning the halo size, the worst conditions (i.e., largest halos) would occur with an IOL of reduced base power (as would be the case of highly myopic patients), large add power, and large pupil. However, the relative intensity of the halo decreases as its size increases. These results contribute to the better understanding of the physical factors (size and/or intensity) that may have an influence on subjective halo perception by patients implanted with such IOLs. © Anita Publications. All rights reserved.
Keywords: Cataract, Presbyopia compensation, Halos, Extended depth of focus, Intraocular lens, Diffractive multifocal lens.

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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