Corrective lenses

thumb|Man with glasses thumb|A woman with glasses

very thin plastic lens worn directly on the eye to correct visual defects

thumb|Joseph Chamberlain wearing a monocle

cause of vision problems

upright|thumb|Anton Chekhov with pince-nez, 1903

thumb|A bifocal lens with areas of differing magnification thumb|Bifocals with separate lenses. In this case, the Swedish ethnologist . Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.

lens implanted in the eye to treat cataracts or myopia

type of corrective lens used in eyeglasses

transmissive optical device worn on the eye to improve visual perception

thumb|right|Orthokeratology lens Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia, hyperopia, and astigmatism.

optical lenses that darken on exposure to certain wavelengths of light

order written by an optometrist or ophthalmologist, specifying parameters of corrective lenses for a particular patient

thumb|French Varilux Logo

type of lens

16.5mm custom milled laser fit scleral lens

a transparent stone used to magnify objects or letters

eyeglass lens with three distinct optical powers

kind of intraocular lens, generally made of plastic or silicone, that are implanted into the eye in front of the natural eye lens