Sudden loss of peripheral vision in left eye followed by headache.?

Migraine is likely. If this was short term, it is probably an occipital migraine. If longer lasting it might be a stroke. You should seek your ophthalmologist the first time this happens to rule out something serious.
Possible migraine. The loss of peripheral vision prior to a headache may be a migraine with aura, the aura may be the vision changes. This should be evaluated by a neurologist to make sure there is no other medical problem. The neurologist can also offer treatment options that will help.

Related Questions

I have been having episodes where I have peripheral vision loss and blurred vision along with a squiggley line in my left eye followed by headache?

Occipital migraine. This is the classic pattern of migraine originating in the occipital (visual) cortex of the brain. If you cover each eye you will notice the pattern in each eye at the same time these are invariably benign, last 2 minutes to 2 hours, and do not have underlying pathology. Most don't have headaches associated but a few do. Read more...
Migraine. Migraine may be the cause of your symptoms. You should see your primary care physician for evaluation and treatment. Read more...

Recovered from TIA except for loss of peripheral vision in left eye and the left side of right. Experiencing further sight loss. Is this usual?

Not a TIA. If you still have vision loss beyond a few hours, you did not have a tia, you had a stroke. If it is getting worse, go directly to the emergency department now. Urgent treatment can stop the loss and maybe reverse it. Read more...
No. It is not normal. Often visual loss after stroke is permanent or get better over time. If your vision is degrading, you should see your eye doctor as soon as possible. Read more...

Yesterday I experienced sudden temporary loss of peripheral vision in my left eye. Which lasted under 1 minute - no headache followed. Any thoughts?

Merits evaluation. Although migraine can cause a transient visual symptom, amaurosis fugax can occur as a result of an embolism of plaque from the carotid artery on the same side as the affected eye; and there are other possible causes of the symptom. A visit to an ophthalmologist would be a good first step. Read more...

I believe I am having peripheral vision loss in my left eye. Should I see an opthamalogist or an optometrist.?

Ophthalmologist. This problem mandates a real-time (face-to-face) meeting with a doctor. A history has to be taken along with a examination as well as labs and other tests. Only after all this will your doctor be in a position to tell you what's wrong and what needs to be done to help you. Read more...