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I have checked and the following is relevant.
CAA - Multifocal implants may be offered by the pilot's surgeon before cataract surgery as an alternative to traditional monofocal lens implants. The CAA does not recommend or approve a particular intraocular lens (IOL) for certification.
A review of randomised controlled trials studying multifocal versus monofocal intraocular lenses after cataract extraction was published by the Cochrane Collaboration in 2016. It reported that distance visual acuity was similar in the multifocal and monofocal groups but people with multifocal lenses achieved better near vision overall and were less dependent on spectacles. Adverse subjective visual phenomena, particularly halos, were common and troublesome in people receiving multifocal IOLs.
Last edited by Georg1na; 13th May 2020 at 09:48.