They explain that very few know to look for the CE mark, which shows glasses have been made to appropriate standards.

An estimated 51 per cent of shoppers buy their sunglasses from online or high street fashion retailers, opting for the latest styles and trends and not necessarily frames or lenses that provide the best protection or coverage.

Stephen Hannan, clinical services director at Optical Express, revealed there can be serious health consequences if protective eyewear is not taken seriously.

He said: 'With a few days of warmer weather upon us, sun worshipping Brits will be ready to soak up some rays, either here or abroad.

'Sunglasses may be a great fashion accessory to team with your favourite outfit, but being sun-wise can help to avoid a variety of eye health problems.'

He went on: 'The sun's UV rays become stronger throughout spring and summer and long-term exposure can cause a variety of eye problems, such as photokeratitis or sunburn for the eyes, which can cause red eye, tearing, sensitivity to light and feeling like you have grit in your eyes.'

Stephen also told how spending too much time unprotected in sunlight could permanently damage your eyes.

He revealed: 'It can also increase your risk of cataracts, a long-term condition where a cloud develops over the eye lens, causing blurred vision.