Vision RX20 Review problem in the brain known as amblyopia-also called "lazy eye." Vision develops in children between birth and age 10 to 12. During that time, the eye and brain learn to work together. A child whose vision is developing normally will combine the two images from the left and right eyes into one picture for the brain to interpret. A child who is unable to focus both eyes on the same object sees two different pictures. The brain does not know how to combine these pictures in a way that makes sense, so it ignores the image from the weaker eye
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