Study: First-born children are 10% more likely to be short-sighted

First-born children are more likely to be short-sighted than their younger siblings, according to a study.

Experts say that first children are more likely to have been pushed to do well in school – with hours staring at books harming their eyes.

Scientists at Cardiff University analysed health records from 89,000 British people aged between 40 and 69.