Flowchart for the classification of causes of monocular transient visual loss (TVL) and the appropriate investigations. AC = anterior chamber; BP = blood pressure; CBC = complete blood count; CRP = C-reactive protein; CRVO = central retinal vein occlusion; CTA = computed tomography angiography; DWI = diffusion-weighted imaging; ESR = erythrocyte sedimentation rate; IOL = intraocular lens; MRA = magnetic resonance angiography; MRI = magnetic resonance imaging; ONH = optic nerve head; TAB = temporal artery biopsy; UGH = uveitis-glaucoma-hyphema.