<prompt> Ischemic necrosis in alkali burn is -Stage IStage IIStage IIIStage IV  <response>: Ans. is a i.e., Stage I o Alkali bums are among the most severe chemical injuries to eye.o Common alkalies responsible for bums are liquid ammonia most harmful, lime, caustic potash or caustic soda,o Clinical features are divided into three stages.Acute ischemic necrosis Stage I In this stage there are signs in conjunctiva edema, congestion, necrosis, copious discharge, cornea sloughing, edema and opacity and iris iridocyclitis,Reparation Stage IIConjunctival and comeal epithelium regenerate, and there is comeal neovascularization. Complications Stage III Symblepharon, recurrent corneal ulceration, complicated cataract, secondary glaucoma. 