<unk>  is a white or gray opaque ring in the corneal margin peripheral (corneal) opacity, present at birth, or appearing later in life, and becoming quite frequent in those over 50; it results from cholesterol deposits in or hyalinosis of the corneal stroma and may be associated with ocular defects or with familial hyperlipidemia. Unilateral<unk>  can be due to decreased blood flow to the affected eye due to carotid artery disease or ocular hypotonia.In younger people, the same condition is termed as<unk>  juvenilis.
Arcus senilis
Pachyonychia congenita
Lichen striatus
Linitis plastica
Sterculia
Trichostasis spinulosa
Balanitis circinata
Hydroa vacciniforme