An example of when this ability is needed is when a child looks from book to chalkboard and back again. Usually occurring before age six, amblyopia is the loss of vision or lack of development in one eye unrelated to any health problem. Amblyopia usually results when both eyes are not used together. Because the images sent to the brain from each eye differ, the brain eventually learns to ignore the image sent by one eye and sees only with the good eye. Early detection and treatment is important to avoid permanent loss of eyesight.
Treatment can involve using corrective lenses, prisms and patching the good eye.
In most cases, a combination of treatment techniques will need to be used. Astigmatism With astigmatism, the front surface of the eye, the cornea, is irregularly shaped, and light is not focused correctly on the retina. This causes eyesight to be blurred at all distances. Astigmatism can generally be treated with prescription eyeglasses or contact lenses. Cataracts Cataracts occur when the clear lens of the eye becomes clouded, resulting in blurred or hazy eyesight.