Intraocular Lenses (IOLs)

Intraocular lenses (IOLs) are typically small plastic lenses that are implanted to replace the natural crystalline lens of the eye during cataract surgery. Modern lenses are usually flexible, and they are folded during insertion to minimize the disruption to the eye at the time of surgery.  

There is some information on Wikipedia about IOLs here:

Wikipedia page for intraocular lenses ]