Diagnostic features of the Kayser-Fleischer ring on a slit-lamp examination:
(1) orange, brown, bluish or gray deposits in Descemet's membrane
(2) separated from the limbus by a clear zone
False negative conditions for Kayser-Fleischer rings:
(1) approximately 10% of patients with a neuropsychiatric presentation
(2) up to 50% of patients with hepatic presentation
(3) often incomplete early in the course of the disease, becoming circumferential only later
False positive conditions with a Kayser-Fleischer-like (pseudo-Kayser Fleischer) ring:
(1) primary biliary cirrhosis
(2) autoimmune chronic active hepatitis
(3) neonatal hepatitis
