Temperatures have risen to 36C during a sizzling heatwave that has mercilessly swept through Britain. [That's a heatwave so severe trains are being cancelled amid fears tracks will buckle.]
In this scorching heat it's obviously sensible to protect your eyes - however it's worth noting some sunglasses could cause eye damage.
Sunglasses without 100% UV protection are particularly harmful, allowing ultraviolet light rays to enter the back of your eye.
Your sunglasses need to be dark enough for comfortable viewing, which will obstruct the sunlight from entering your eye.
It's also worth noting that when wearing tinted glasses, using an amber or a brown lense can block out blue light and can distort colour.
Our bodies have some built-in mechanisms to restrict the amount of light that gets into our eyes, science charity The Royal Institution, explains.
These natural light-restricting features include the placement of our eyes deep inside our skull and our brows and eyelashes which act as protective shields and shades. But one cannot rely on nature alone.
Eye damage is less likely if you are wearing a high-standard of sunglasses and the important features to look out for are tinting and UV protection.
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Fun fact: Did you know the earliest known existence of sunglasses come via Walrus ivory carved snow goggles courtesy of the Inuits of the Arctic, who created them to protect their eyes from the sun reflecting on the snow way back in 1200 AD?
Sunglasses have come along way since then though, so get a quality pair!