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How do the eyes work together?
With normal vision, both eyes aim at the same spot. The brain then fuses the two pictures into a single three-dimensional image. This three-dimensional image gives us depth perception.
When one eye turns, the brain receives two different pictures, which do not exactly overlap. In a young child, the brain learns to ignore the image of the misaligned eye and sees only the image from the straight or better eye. However, the child is likely to lose depth perception.
Adults who develop strabismus often have double vision because the brain is already trained to receive images from both eyes and cannot ignore the image from the turned eye.
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