Uniocular loss of vision lasting seconds to minutes, but may last up to 2 hours. Following which vison must return to normal. Such episodes may have occurred in the past.
What is it?
Embolus from the carotid artery, heart or aorta or a form of vascular insufficiency as a result of arteriosclerosis; cardiac arrhythmia; hypercoagulation, rarely tumours of the orbit.
For the cardiovascular cause treatment is referred to the specialist. Ideally all such cases must be thoroughly worked up by the consultant physician/cardiologist.
For the eye, treatment with a calcium channel blockers is useful.