Amblyopia is an eye condition that develops in children (that can also be present in adults) in which the vision in one eye is weaker than in the other. This occurs in the absence of evident ocular (eye) abnormalities that usually can explain the poor vision. Because amblyopia can have serious, permanent effects on your child, it is important that he or she have regular vision tests.
The most common cause of amblyopia is a significant difference between the focusing powers of the two eyes. For example, one eye may be very farsighted while the other one is not, or one eye has a lot of astigmatism (vision is blurred because the eye has an irregular shape), and the other eye does not. Your child's pediatrician or the vision program at school will check three features of your child's eye health: Do your child's eyes let light all the way through? Do both eyes see equally well? Are the eyes moving normally? Are they aligned normally? If there seems to be a problem (something blocking the light, the vision is unequal, a problem with the movement of the eyes),