The<unk>  can re-canalize over time and the edema can clear. However, optic atrophy leads to permanent loss of vision. Irreversible damage to neural tissue can occur after approximately 15 minutes of complete blockage to the<unk>  retinal<unk> , but this time may vary between people. Two thirds of people experience 20/400 vision while only one in six will experience 20/40 vision or better.
Central retinal artery occlusion
Branch retinal artery occlusion
Branch retinal vein occlusion
Retinal vasculitis
Central retinal vein occlusion
Arteritic anterior ischemic optic neuropathy
Posterior ischemic optic neuropathy
Ischemic optic neuropathy