If you can't see, or if you can't hear, you will have trouble learning. As obvious as that seems, the fact is that problems with seeing and hearing are NOT obvious. Many children have seeing and hearing difficulty and we don't know it. We aren't born with mature seeing and hearing. Our brains develop for these - except when they don't.
Children are commonly farsighted, and the ability to focus and track across a line of text and jump efficiently to the beginning of the next line is a skill that has to be developed. But what if focus and tracking don't develop in time for school? Eyes must be the right shape to allow focus, and eye muscles must be coordinated to work together efficiently. But that's just the beginning, because after images are focused on the retina in the back of the eye there are complex brain pathways and processes that allow actually seeing and understanding what that image means. Both eye mechanics and visual brain processing are involved. Many glitches are possible. Early focusing problems certainly interfere with the development of efficient brain processing.
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