Normally we all know that contact lenses were made to help us see things better, deceiving people if they don’t come up close to see that these little optical solutions are worn in lieu of the usual eyeglasses. And normally, people would take them out before they sleep since it would be entirely irritating if they would keep them on and then snooze.

To help broaden the reason for people to make sure that they remove these contact lenses, it has been proven that these can cause eye infections while you are sleeping if you fail to do so.

But like technology, there is a new breed of contact lenses that can be used only when you sleep and have been called Overnight lenses.

Although they should be worn every night, it takes a few days for the effects to wear off completely. In theory, you could avoid wearing them for a night or two, although your vision would gradually deteriorate.

This technique, known as orthokeratology, has existed for centuries. It’s thought the Chinese slept with small weights or sandbags on their eyelids to reduce short-sightedness.

‘But until recently,’ says Dr Susan Blakeney, optometric adviser to the College of Optometrists, ‘it has been considered unreliable, as there was never any guarantee the lenses would work.

‘Since then, techniques such as corneal topography - where the curve of the cornea is measured - have developed. This means lenses can be made to fit the curve of each person’s eye very accurately.’

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