Features of keratoconus:     Munson's sign that is a distortion of lower lid margin caused by bulged cornea when the patient looks in downward gaze Folds and ruptures in Descemet’s Membrane Fleischer's ring that is a brownish ring of hemosiderin at the base of the cone Visible or enlarged corneal nerves Vogt's striae lines in post stroma of cornea which disappear on pressure