The brain and the eye work together to produce vision. Light enters the eye and is changed into nerve signals that travel along the optic nerve to the brain. Amblyopia is the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly. The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye. As a result, the affected eye fails to develop normal vision, and therefore has trouble seeing details. It has been estimated to affect 1–5% of the population. 
Amblyopia is caused primarily by one of two factors: improper alignment of the eyes (known as strabismus), or unequal refractive power. If the child's eyes are not properly aligned, the brain will receive two different images from the eyes. Perceiving double vision, the brain will not use the image from the weaker eye. This eye, through lack of use, gradually loses its ability to function.
The second primary cause of amblyopia is significantly unequal refractive power in the two eyes. For example, one eye may be very farsighted or nearsighted while the other eye may have normal vision. Again the brain receives different images from the two eyes and suppresses the image from the weaker eye.
Other causes of amblyopia include:
Family history of amblyopia Astigmatism in both eyes Childhood cataracts
Ambylopia can also occur physiologically after tobacco or alcohol consumption.
What are the causes of Amblyopia?
The brain and the eye work together to produce vision. Light enters the eye and is changed into nerve signals that travel along the optic nerve to the brain. {{NAME}} is the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly. The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye. As a result, the affected eye fails to develop normal vision, and therefore has trouble seeing details. It has been estimated to affect 1–5% of the population. 
{{NAME}} is caused primarily by one of two factors: improper alignment of the eyes (known as strabismus), or unequal refractive power. If the child's eyes are not properly aligned, the brain will receive two different images from the eyes. Perceiving double vision, the brain will not use the image from the weaker eye. This eye, through lack of use, gradually loses its ability to function.
The second primary cause of amblyopia is significantly unequal refractive power in the two eyes. For example, one eye may be very farsighted or nearsighted while the other eye may have normal vision. Again the brain receives different images from the two eyes and suppresses the image from the weaker eye.
Other causes of amblyopia include:
Family history of amblyopia Astigmatism in both eyes {{ORGANIZATION}} cataracts
{{NAME}} can also occur physiologically after tobacco or alcohol consumption.