Double Vision
Double vision or diplopia is seeing two images. It can occur with one eye open or with both open. It can be very disorienting. When it occurs with one eye open, it is because of a media opacity like a cataract. To resolve this type of double vision the media opacity needs to be removed or corrected. When diplopia happens with both eyes, it is because of a misalignment between the two eyes involving the extraocular muscles or the nerves that innervate them. When double vision is a new concern, it should be thoroughly investigated for signs of disease. With both eyes the underlying cause should be resolved, if possible. Other options include surgery on the extraocular muscles or using prisms in a glasses prescription. The prism compensates for the misalignment and optically places the images together so the brain can fuse them.
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