<prompt> A Middle aged man brought to casualty with unilateral headache, right eye congested and painful, with sudden vision loss. The diagnosis isAngle Closure GlaucomaCorneal edemaCRVOCRAO  <response>: A Angle Closure Glaucoma Angle-closure glaucoma, also known as narrow-angle glaucoma, is caused by blocked drainage canals in the eye, resulting in a sudden rise in intraocular pressure. This is a much more rare form of glaucoma, which develops very quickly and demands immediate medical attention. Symptoms of angle-closure glaucoma may include: Hazy or blurred vision: The appearance of rainbow-colored circles around bright lights Severe eye and head pain Nausea or vomiting accompanying severe eye pain Sudden sight loss 