Visual Processing Functions
Vision and eyesight are not the same things. Eyesight is the ability to see something clearly, this is what is tested with eye chars by pediatricians, schools, and regular visits to the optometrist.
Vision develops as a child grows. It is the brain's ability to use the images from both eyes, to coordinate the images, and control the eye's movements. Since this isn't learned until after birth it sometimes does not develop properly.
It can lead to dysfunctions of vision that cause learning disabilities, especially in writing, reading, & math.