<prompt> A lady presented with reddish eye and watering over left eye with a shallow anterior chamber. What is the next best investigation?TonometryCup disc ratioGonioscopyOphthalmoscopy  <response>: Ans. a TonometryShallow AC with redness- points towards PACG in a female. In acute stages, IOP is markedly raised - Do tonometry followed by gonioscopy fundus examination. 