<prompt> Intravenous Mannitol is indicated inNormal tension glaucomaAcute angle closure glaucomaSympathetic ophthalmitisPrimary Open angle glaucoma  <response>: Iv mannitol is an hyperosmotic agents which acts by increasing the osmotic pressure in the plasma thereby imbibing water from the vitreous . Indications:- Acute rise in IOP -- Primary angle closure glaucoma, Secondary angle closure glaucoma , Posner Schlossman syndrome In the pre-operative period to reduce IOP in case of lens induced glaucomas, trabeculectomy, etc. Dosage:- 1-2 mg kg body weight ; 20 solution Adverse Effects:- Volume overload in cardiac patients Increase in BP Other Hyperosmotic Agents: - Glycerol - increases blood glucose, Contraindicated in Diabetics. Urea - not routinely used Isosorbide Ref:- Parsons Diseases of the eye 22nd edition; pg num:- 53,76 