<prompt> Open angle glaucoma causes -Sudden loss of visionDifficulty in dark adaptationAmaurosis fugaxUniocular diplopia  <response>: 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 fugaxTransient 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 