<unk>  and accommodating intraocular<unk> es are artificial intraocular<unk> es (IOLs) that are designed to provide focus of both distance and near objects, in contrast to monofocal intraocular<unk> es which only have one focal point and correct distance vision. The issue of restoring accommodation following cataract surgery or through refractive<unk>  exchange is becoming an increasingly important topic in ophthalmology. Intraocular<unk> es that correct presbyopia are divided into two main categories: *<unk>  IOLs: achieve near and distance vision by having two (bifocal) or three (trifocal) focal points simultaneously. The function of<unk>  IOL depends on the pupil size for refractive types. The concept is based on the principle that the pupil tends to constrict for near tasks, so the central portion of the<unk>  is designed for near and the outer portion for distance. For diffractive types of<unk>  IOLs, light is split by diffraction and the vision is pupil independent. * Accommodating IOLs: change in shape and power when the ciliary muscle contracts gives an advantage over regular IOLs.
Multifocal intraocular lens
Angle-supported intraocular lens
Trifocal lenses
Argus retinal prosthesis
Corrective lens
Adjustable-focus eyeglasses
Ocular prosthesis
Retinal implant