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Multiple sclerosis is accompanied by optic neuritis, and there is demyelination of the optic nerve, causing the action potential to be propagated more slowly along axons. But how does this lead to blurred vision?

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Demyelination per se is not the whole story behind the blurring of vision seen in MS patients.

MS results in an inflammation of the optic nerve (optic neuritis) and demyelination of the optic nerve fibers. It is commonly seen in MS, and is associated with blurred vision, basically because the signals are not sent properly along the optic nerve. Blurred vision in MS can have several reasons. These include:

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