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When the ciliary muscle is relaxed, the lens flattens to enable clear distance vision.
Crystalens and Trulign Toric are premium intraocular lenses (IOLs) that correct presbyopia as well as common refractive errors, enabling an expanded range of clear vision and a decreased need for eyeglasses after cataract surgery, compared with surgery performed with conventional monofocal IOLs.
Another type of presbyopia-correcting IOL that is an alternative to accommodative IOLs is the multifocal IOL category.
Like multifocal contact lenses, these premium IOLs have more than one power, with added magnification in certain zones of the lens for improved near vision.
The ciliary muscle, ciliary zonules and lens capsule keep the lens suspended in its proper position inside the eye for clear vision.
In a normal eye (without presbyopia or cataracts), this dynamic process of accommodation adjusts the focusing power of the eye by changing the thickness of the eye's natural lens.
Both categories or presbyopia-correcting lenses accommodating IOLs and multifocal IOLs have advantages and limitations.