Causes of Amblyopia

amblyopia.jpgA misalignment of the eyes (strabismus) is the most common cause of functional amblyopia. The two eyes are looking in two different directions at the same time. The brain is sent two different images and this causes confusion. Images from the misaligned or “crossed” eye are turned off to avoid double vision. In Anisometropia there is a difference of refractive states between the two eyes. Cataract cause the image to be blurrier than the other eye. The brain “prefers” the clearer image. The eye with the cataract may become amblyopic. Ptosis is the drooping of the upper eyelid. If light cannot enter the eye because of the drooping lid, the eye is essentially not being used. This can lead to amblyopia. Nutritional deficiencies or chemical toxicity may result in amblyopia. Alcohol, tobacco, or a deficiency in the B vitamins may result in toxic amblyopia. Amblyopia can run in families.



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