An<unk>  <unk>  (also known as<unk><unk> <unk> ,<unk>  implant or<unk>  insert) is a small device implanted in the eye to correct vision. The procedure involves an ophthalmologist who makes a small incision in the<unk> of the eye and inserts two crescent or semi-circular shaped<unk><unk> s between the layers of the<unk>  stroma, one on each side of the pupil. The embedding of the two<unk> s in the<unk> is intended to flatten the<unk> and change the refraction of light passing through the<unk> on its way into the eye. __TOC__
Intrastromal corneal ring segment
Corneal button
Intraocular lens
Choroidal neovascularization
Corneal neovascularization
Foveal avascular zone
Corneal inlay
Progressive lens