<unk> s (KF<unk> s) are dark<unk> s that appear to encircle the iris of the eye. They are due to copper deposition in part of the cornea (Descemet's membrane) as a result of particular liver diseases. They are named after German ophthalmologists Bernhard<unk>  and Bruno<unk>  who first described them in 1902 and 1903. Initially thought to be due to the accumulation of silver, they were first demonstrated to contain copper in 1934.
Kayser–Fleischer ring
Rey–Osterrieth complex figure
Sorsby's fundus dystrophy
Forchheimer spots
Hutchinson's pupil
Nagayama's spots
Koplik's spots
Bitot's spots