<prompt> Sudden acute loss of vision with shallow anterior chamber is suggestive ofAcute angle closure glaucomaAcute iridocyclitisOpen angle glaucomaViral keratitis  <response>: Answer- A. Acute angle closure glaucomaLid edemaConjunctiva is chemosed and congested both conjunctival ciliaryvessels are congested o Cornea is oedematous and insensitive Anterior chamber is very shallow with aqueous flare Angle of anterior chamber is closed on gonioscopy Iris is discoloured.Optic disc is oedematous hyperemic Fellow eye shows shallow anterior chamber and a narrow angle. 