Myopia seems to be far more of a childhood environment thing than a genetic thing. For a long time it was thought to be from too much close viewing (reading books, sitting short distances from screens), but more recent research suggests it is more from lack of sun exposure. UV light prompts the formation of dopamine, and higher dopamine levels in the eyeball are required for it to maintain the optimal round shape as it grows.
Myopia seems to be far more of a childhood environment thing than a genetic thing. For a long time it was thought to be from too much close viewing (reading books, sitting short distances from screens), but more recent research suggests it is more from lack of sun exposure. UV light prompts the formation of dopamine, and higher dopamine levels in the eyeball are required for it to maintain the optimal round shape as it grows.