A 45 year old woman had her visual acuity checked at her local optician. 12 hours later she presents to the emergency department with severe pain and redness in her eye. What is the single most appropriate option?

The key is C. Anterior chamber. [In acute angle closure glaucoma half-dilated pupil is the most likely position which precipitates an acute attack as the trabecular meshworks are mostly closed by peripheral anterior synechia of peripheral iris in this position. And mild illuminated darkened room like of an optician (also use of mydriatics accelerates this) or opera (cinema hall) are culprit to make this! As the block occurs in anterior chamber it is the likely option here].