A team of Japanese researchers has found that people who have suffered from heatstroke were twice as likely to develop cataracts. | GETTY IMAGES

With another brutally hot summer just around the corner, a team of Japanese researchers has a stark message: Heat stress could damage your eyesight.

A review of Japanese health insurance records covering 2.46 million people found that those who have suffered from heatstroke are twice as likely to develop cataracts. The condition clouds the eye lens and blurs vision.

In a study recently published in the Environmental Research journal, the researchers at the Nagoya Institute of Technology (NITech) said the risk of cataracts is 1.96 times higher for those with a history of heatstroke.

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