This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Sudden acute loss of vision with shallow anterior chamber is suggestive of 
Select and explain. 
A. Acute angle closure glaucoma, B. Acute iridocyclitis, C. Open angle glaucoma, D. Viral keratitis
A: Acute angle closure glaucoma
Answer: A: Acute angle closure glaucoma 
Explanation: 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.