A transient loss of the retinal blood supply, generally due to an embolus from carotid artery atheroma, leads to temporary loss or vision.
Clinical Features
Sudden painless loss of all or part of vision in one eye
Spontaneously resolves fully within 24 hours, usually within minutes
Features of giant cell arteritis (GCA) may be present
Emboli to the brain may lead to Transient Ischaemic Attacks (TIA) or strokes
Lack of spontaneous resolution leads to permanent loss of vision due to retinal artery occlusion
Management
Start low dose aspirin if possible
See ophthalmologist immediately if visual loss still present; otherwise see GP for early referral to ophthalmologist
In presence of features of GCA urgent investigation is required
