ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Diving contact lenses. Free- diver wearing specially designed contact lenses, rather than a diving mask. Contact lenses are thin plastic lenses worn on the surface of the eye to correct vision, as an alternative to glasses. Diving lenses are much larger than standard contact lenses, as they wrap round the eyeball, under the eyelids. Free-diving is an extreme sport, whereby the diver uses as little equipment as possible. They do not use oxygen tanks, instead they take a breath at the surface of the water before descending. A well trained free-diver can hold their breath for up to 7 minutes.
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