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Trifocal IOLs are popular presbyopia-correcting IOLs in many areas outside of the United States.Compared to the bifocal diffractive IOL, the trifocal IOL improves intermediate vision by providing a third focus.These developments include presbyopia-correcting IOLs which provide a treatment option for presbyopic patients who do not qualify for laser refractive surgery and do not want to rely on reading glasses.Presbyopia-correcting lenses can be divided into three broad categories: multifocal IOLs, extended depth of focus IOLs, and accommodative IOLs.This may be explained by the nature of the two lenses, with diffractive lenses producing clear images at near and far with less-than-optimal intermediate vision, and refractive lenses improving vision at all distances.The Crystalens accommodative IOL produced good patient satisfaction with patients reporting adequate vision at all distances in order to complete activities of daily living, with the exception of needing reading glasses for fine newspaper print.Accommodative IOLs as a whole produce less visual disturbances compared to multifocal IOLs.This can be explained by the design of the accommodative lens which contains a smooth central surface and acts to enhance near vision through movement in conjunction with ciliary muscle contraction.
In a prospective study of 95 eyes comparing multifocal IOLs to monofocal IOLs, 29% of multifocal patients reported glare while 25% reported halos, compared to 19% and 12% in the monofocal group, respectively.
The difference is that the lens is surgically implanted in the eye and offers a permanent, maintenance-free solution to presbyopia.
There are several different types of multifocal IOLs approved by the FDA for use in the U. The lenses below are the most commonly used multifocal IOLs in the U.
A prospective study comparing refractive lens exchange with multifocal IOL implantation to LASIK-induced monovision, found no significant difference in patient satisfaction or spectacle dependency between the two groups.
Traditional cataract surgery has primarily been used to restore distance vision.These surgical complications include, but are not limited to infection, increased IOP, corneal edema, posterior capsular opacification (PCO), IOL decentration, and retinal detachment.