If you’ve ever had a check-up, you’ll be familiar with the process of having a tiny puff of air blown onto your eyeball or the optometrist shining a bright light into the back of your socket. Those checks aren’t to do with your eyesight but rather your overall eye and head health – which is why it’s so important to have check-ups even if you don’t have deteriorating eyesight.

“There’s a misconception that regular eye tests are only for people who have noticed a change in their sight, but that’s just a small part of why they are so important,” stresses Dr Best. “More than checking your vision, an eye test is an overall eye health check, inside and out.”

And those doctors can see a lot more than eye-related issues. “Your eyes can even indicate signs of general health problems like hypertension and diabetes.” And very rarely, eye tests can pick up really serious things such as brain tumours.

So yes, it’s hugely important to have your eyes checked – especially if you’re experiencing eye strain and headaches that don’t get better when following the 20:20:20 rule.

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