STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Artificial eye lens. Macrophotograph of a plastic eye lens prothesis (intra-ocular) used to replace a damaged eye lens. There are many different lens implant designs which may be positioned in front of the iris, clipped to the pupil, or held behind the pupil with delicate plastic loops or hooks. A lens implant usually provides excellent distance vision without glasses, but glasses are usually necessary for close vision.
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