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
Painless loss of vision is seen in all, EXCEPT: 
Select and explain. 
A. Papilledema, B. Papillitis, C. Angle closure glaucoma, D. CRAO
C: Angle closure glaucoma
Answer: C: Angle closure glaucoma 
Explanation: Acute angle-closure glaucoma is an ophthalmic emergency that causes severe visual loss without treatment. Symptoms include ocular pain, blurred vision, lacrimation, halos around lights, frontal headache, nausea, and vomiting. Causes of Sudden Painless Loss of Vision: Retinal detachment Vitreous haemorrhage Retinal vein occlusion Retinal aery occlusion Wet age related macular degeneration Anterior ischemic optic neuropathy Optic neuritis Cerebrovascular accident Papillitis Papilledema