There is a relationship between screen time on cell phones and i pods. Not much data on TV alone as it is usually across the room. Just be sure your child gets a lot of time outdoors so his distance vision is stimulated. And do not use a video device as a baby sitter. Very unlikely that he is nearsighted at 4 years of age but there are better things at that age for him/her to do than TV.
Answered 8/4/2023
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