New contact lens wearers often worry that a contact lens might move behind the eye and get stuck there. Thankfully, the anatomy of the eye prevents this. The eye is protected by a soft pink tissue lining known as the conjunctiva, which creates a pocket between the eyelid and the eyeball and keeps contact lenses on the front surface of the eye.

Occasionally, a lens might slide into this pocket, for example, because of a bad fall, but it often finds its way out again with the help of tears or eye drops. A trained optician can also help.

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Asked by: Sarah Morris, Swansea

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Authors

Dr Claire Asher is a science journalist and has a PhD in Genetics, Ecology, and Evolution (GEE) at the University of Leeds. She also works part time as Manager of the UK Robotics and Autonomous Systems (RAS) Network, based at Imperial College London. Asher is also the author of Brave Green World: How Science Can Save Our Planet.