Double vision is a symptom of something abnormal going on within your eye, brain, or nervous system. First and foremost, it is not something that should go unchecked or ignored. If you are experiencing double vision, please visit your nearest optometrist as soon as possible for a check-up. It is also recommended not to drive until you have had a medical examination.
"Seeing Double" is sometimes regarded as a funny gesture but it medically means what it says, Double vision, or "seeing double," occurs when two nonmatching images are sent to the part of the brain that is responsible for processing visual input. If this occurs over the long term, the brain will eventually compensate for the two signals by suppressing one signal, so that a single image is perceived. The suppressed eye may eventually become lazy with resultant vision loss.
Double vision is called "monocular" when the double image is perceived by an eye that is tested alone. In "binocular" double vision, each eye sees a single image when tested alone, but a double image is present when both eyes are open.
Causes Of Double Vision
It is important that in the search for cause the doctor should carefully review the history and perform an examination to determine the cause and initiate appropriate treatment where necessary as most causes of monocular diplopia stem from poor focusing of light by the eye. Refractive errors (myopia, hyperopia, astigmatism) are causes. Dry eye, Cataracts, corneal irregularity from keratoconus, swelling or scars, and retinal conditions may cause Monocular double vision, However Binocular double vision is produced by a misalignment of the two eyes, which in some instances can be caused by life-threatening conditions. For example, aneurysms, strokes, trauma (head injury), and increased intracranial pressure and requires medical emergency.
Other diseases affecting the nervous system can lead to binocular double vision. include multiple sclerosis, Guillain-Barré syndrome, Migraine headaches, and myasthenia gravis.
Binocular double vision can also occur with damage to the eye muscles themselves. Graves' disease (often associated with thyroid disease), orbital inflammations, vascular disease (as seen with diabetes and high blood pressure), and others are examples of diseases that directly affect the extraocular muscles through compression, poor blood supply, or local eye inflammation. Childhood strabismus (eye misalignment), such as crossed eyes may also cause binocular double vision amongst others.
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