Diplopia (double vision) is a rare but disturbing condition. It happens when the images of objects before you are formed in different parts of the retinas in your two eyes. Many disorders of the eye and nervous system cause you to see two of everything. This condition can make your daily activities difficult. Prism lenses have the property of changing the direction of light rays. They can be used to make sure both your eyes form images in the same place. Prism lenses are valuable in both assessing double vision and reversing it.
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Diplopia, or double vision, is a condition in which you see two of everything. The two images could be above and below each other, side to side, tilted, or any combination of these.
The eyeball has six muscles attached to it, which are controlled by three cranial nerves. If any of these muscles don't work as they should, your eyes don't move as a pair and become misaligned. This causes you to see double. Diplopia makes it difficult to judge distances, and reading and everyday tasks may become impossible.
Double vision has many causes:
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Double vision can be a sign of a serious disease, so you should always consult your doctor when it happens. They'll try to find the cause and begin treatment. They'll also refer you to an ophthalmologist or optometrist for relief of the double vision.
Double vision can sometimes be treated with eye exercises to improve the strength of the weak muscle. Your doctor may give you a prism to stick on your glasses as a temporary measure. If you see better with these temporary prisms, the prisms can be added to your prescription glasses. Sometimes, your ophthalmologist may give you a prism to further separate the two images so that one is ignored. If none of these methods work, you can cover one eye at a time to stop seeing double.
Prism lenses are made of plastic or glass and are wedge or triangle shaped. Light rays change direction on entering the prism lens and again when exiting. This property is used to ensure that the images of objects are formed in the same area of the retina in both eyes.
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