causes sudden loss of vision

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What can cause sudden loss of vision in the lower half of one eye?

Decreased blood flow

Eye
Your very precise description is consistent with interruption of blood flow in a branch of the retinal artery on one side. This needs attention, as a stroke risk would be present. Unlikely that this represents migraine. See an ophtalmologist ASAP.
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What would cause sudden loss of vision in the right upper corner of the eye?

Many things

Vision
This problem can only be solved by seeing your doctor and being evaluated face-to-face. After a thorough examination, your doctor should be able to tell you what's wrong and what to do about it.
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Dim vision,loss of balance,blood rush through head and almost fainting. Was that from low blood sugar?

Probably not

Blood
Low blood sugar usually causes sweating, tremors, headaches, and palpitations. It would need to be very prolonged or severe to cause confusion or loss of consciousness. The symptoms you mention are most often caused by reduced blood flow to the brain, from low blood pressure. You should be checked out by your physician.
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Dr. Jay C. Bradley answered:

I have really dim vision at night. Could it be night blindness?

Night blindness

Nocturnal
Decreased vision in dim illumination can be normal or it may be related to eye related disease. See an eye doctor to determine the cause and initiate proper treatment.
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Can poor vision (not blindness, but bad near-sightedness) lead to depression or anxiety?

Yes

Impaired_vision
Any chronic medical difficulty can lead to an increased risk of emotional problems. If a person has poor vision without good correction, it would be easy to understand how this could lead to increased stress and frustration.
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Dr. Harvey Fishman answered:

What are the common causes of sudden loss of vision in the lower half of one eye?

Optic neuropathy

Vision
This is a classic symptom of ischemic optic neuropathy although it usually occurs in the upper visual fields . Other possibilities include retinal detachments , arterial occlusions of the retina, infections, and autoimmune disease of the retinal vascular system. The list is extensive and this just names a few .
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What are the common causes of temporary loss of vision?

No one best answer

Vision
temporary loss my be innocuous. blurred vision from dryness, wrong glasses, medication side effects are temporary but so are many other more serious conditions that may lead to sudden and maybe permanent loss. Mini strokes to the eye or brain, intermittent glaucoma attacks, optic neuritis, small hemorrhages in the eye (diabetics) to name a few. see your Eye MD ASAP
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What causes temporary loss of vision?

It depends.

Loss_of_vision
The word "temporary" could mean seconds or days. Brief loss of vision could be related to common problems like low blood pressure or migraines. Longer periods of vision loss are often due to more serious problems. In any case, an ophthalmologist and/or neurologist should be involved.
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What causes dizziness and temporary loss of vision?

More than one thing

This could be neurologic, cat this could be migraine it needs evaluation. You want to prevent temporary to become more lasting
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Dr. Andrew Shatz answered:

What causes nausea, extreme sweat, and loss of vision?

There are a few...

Perspiration
...causes, including dehydration, diabetes, heat exhaustion, and certain medications. If you know anyone suffering from these symptoms, they need to seek medical attention immediately.
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