Cardinal Features Of Keratoconus   Munson's Sign- Distortion of the lower lid margin caused by bulged cornea, when the patient looks in the dowward gaze. Folds and ruptures in Desmet membrane  VOGT Straie preset in post corneal stroma, disappear on pressure Visible or enlarged corneal nerves Fleisher's ring- brownish ring f hemosiderin at the base of the cornea