<prompt> Diagnose:-KeratoconusWilsons diseaseGlaucomaWilliams syndrome  <response>: Wilsons disease Kayser - Fleischer rings KF rings are dark rings that appear to encircle the iris of the eye. Itoccurs due to copper deposition in Descemets membrane of cornea. In case of Wilsons disease, KF rings are present in 95 of patients with neurological symptoms, 50-60 of patients with hepatic involvement alone, and only in 10 of asymptomatic siblings. Early detection of KF ring is best possible with gonioscopy, although it is most commonly detected by slit-lamp examination. 