n :  a brown or greenish brown ring of copper deposits around the cornea that is characteristic of Wilson's disease
 
Kayser, Bernhard (1869-1954), and Fleischer, Bruno Otto (b 1874), German ophthalmologists. Kayser described the corneal ring that is a diagnostic symptom of Wilson's disease in 1902. Fleischer published his own description.
 
 
 
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