This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Open angle glaucoma causes - 
Select and explain. 
A. Sudden loss of vision, B. Difficulty in dark adaptation, C. Amaurosis fugax, D. Uniocular diplopia
B: Difficulty in dark adaptation
Answer: B: Difficulty in dark adaptation 
Explanation: ***Sudden painless loss of vision :CRAO,vitreous hemorrhage,Retinal detachment involving macular area,Ischaemic cntral retinal vein occlusion ***sudden painless defective vision:central serous retinopathy,Optic neuritis, Methyl alcohol amblyopia, Non-ischaemic central retinal vein occlusion ***sudden painful loss of vision:Acute congestive glaucoma,acute iridocyclitis,chemical injuries to the eyeball, Mechanical injuries to the eyaball ***Amaurosis fugax(Transient loss of vision):carotid aery disease, papilloedema,Giant cell aeritis,Migraine,Raynauds disease,severe hypeension,Prodromal symptoms of CRAO ***uniocular diplopia:subluxated lens,Double pupil,incipient cataract,keratoconus Ref Ophthalmology AK khurana -6th edition