How does astigmatism cause double vision?

Out of focus. Astigmatism makes a misshapen image (changed in one axis) and thus can have blurred edges and appear doubled or ghosted.
Astigmatism. Astigmatism prevents light rays from focusing together at the back of the eye. Because there is more than one focal point in the back of the eye when astigmatism is present, double vision results.

Related Questions

Astigmatism causes double vision?

It can. Astigmatism can distort vision enough to cause an image to double. There are many causes of double vision, though and some can be serious. If you are concerned, get examined. Read more...
Possible. High levels can cause double vision if uncorrected. Usually this is not a new problem, so if you are experiencing double vision that wasn't there previously you should see an ophthalmologist to be evaluated. The usual cause is an eye muscle imbalance where the eyes aren't aligned. Read more...
Double vision. Astigmatism can be a cause of double vision. Correcting the astigmatism with glasses, contact lenses or surgery will make the double vision go away. Read more...

M19. 4 weeks ago started having slight double vision. Both eyes. Letters on tv slightly raisedlooks like ghost. Also see rays of light. Optometrist said I have astigmatism in one eye. Causes? 20/20 vis.

Does double vision. Remain when on eye is closed? If so the either an astigmatism or surface eye dryness can be the cause. If the double vision goes away when one eye. Is closed you will have to see an ophthalmologist to evaluate this. Read more...
Ophthalmologist. Try to figure out if your double vision gets better if you close one eye. An ophthalmologist (as opposed to an optometrist) may be better able to sort this out for you. Read more...

Myopic w/ astigmatism & ms, I've had increasing double vision despite being treated w/ tysabri (natalizumab). For correction, do I need ophthalmologist or neuro-op?

Double vision. The double vision is more likely to be due to multiple sclerosis than due to an intrinsic eye problem. Perhaps a neuro-ophthalmologist could provide more insight on your problem, prism may be an alternative. Most cases of double vision due to ms resolve over time. Solumedrol (methylprednisolone) may accelerate the recovery. All other treatment for ms (from Copaxone to tysabri) are intended to reduce relapse rate and are not expected to help or improve any present symptoms related to multiple sclerosis. Read more...
Depends . If your double vision goes away when you close either eye, it's a muscle problem and a neuro-oph would be best (though an ophthalmologist could always see you too). If the double vision seems to be only in one eye, then it is a refractive problem and you should see an ophthalmologist. Could be anything from needing glasses to having a cataract. Read more...
Complex. You are taking a very potent medication, and I would assume the Solumedrol (methylprednisolone) is being used to treat a relapse. As you start to remit, the double vision may seem to worsen, but in fact, your eye maybe responding and stabilizing. Under the circumstances, a neuro-opthalmologist would be helpful, but many general eye specialists could also assist you. But have a discussion with your neurologist also. Read more...