PLAT and temporal arteritis: CRAO: central retinal artery occlusion; CRA: central retinal artery; NA-CRAO: non-arteritic CRAO; VA: visual acuity; GCA: giant cell arteritis; IV: intravenous; IA: intra-arterial; tPA: tissue-type plasminogen activator; RCT: randomised controlled trial; IAF: intra-arterial fibrinolysis; O2: oxygen