Why is myopia rising in children, and what can parents do about it?

Eye experts explain links between screen time and shortsightedness and offer advice on how to prevent it

More than one in three children and teenagers worldwide are shortsighted, according to the largest study of its kind, and there are set to be more than 740m myopia cases worldwide by 2050.

The study has prompted calls for screen time to be discouraged and physical activity increased, but what is shortsightedness, why has it become such a concern, and can anything be done about it?

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