What Causes Double Vision?

Myasthenia Gravis

Double vision can be the result of a disease called myasthenia gravis that causes voluntary skeletal muscles to become excessively weak and fatigued with regular use. The muscle weakness myasthenia gravis causes progressively worsens with the normal use of the affected muscle. Any of the muscles in the body can be affected, but the muscles of the throat, face, and eyes are most commonly affected. The reason behind this is these are the voluntary skeletal muscles utilized the most in everyday life. Weakness in the individual's eye muscles is often the very first symptom of myasthenia gravis to manifest. Muscle weakness is defined as an inability to produce a muscle movement with a maximized effort to do so. When an individual has weakness in the muscles responsible for eye movement due to myasthenia gravis, the eyes are unable to work together with each other and the brain to create a proper depth of field. This discoordination causes the individual to experience double vision.

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