Tuesday, 6 January 2015

What Is Prism Correction On My Eyeglasses?

Prism correction is a component in some prescription eyeglasses that can be used to correct problems that stem from one eye not focusing correctly on the same point that the other eye focuses on. This can happen because of muscle weakness around the eye or for other reasons, and it causes a person’s vision to become out-of-sync. This can lead to double vision and other sight problems.

Prism corrected lenses may or may not have other prescriptions added to them. On its own, the correction just displaces the image seen by one eye, bringing it in line with the image seen by the other eye. This reduces or eliminates the blurriness and double-vision caused by the difference in vision between the two eyes. Prism correction is expressed in terms of dioptres, which specify how much correction is used. These lenses will also specify a “base,” or a direction of correction. The two together describe the extent of the displacement caused by the lenses. 

If you experience double-vision or other related problems that point to vergence dysfunction, your eye doctor will use the Polatest for diagnosis. This test uses a series of images that are designed to call attention to problems with binocular alignment. It will also help to determine the extent of the displacement needed if the test is positive. 

On its prism correction will not help to correct problems stemming from astigmatism or other range-of-vision issues. Prism corrected lessons can also include other vision corrections, though. For patients without astigmatism but with conditions related to vergence dysfunction, glasses with prism correction but without any other effects might be used. Your eye doctor can provide more details about your specific prescription. 

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