Prosthetic eye lenses. Macrophotograph of five plastic protheses used to replace damaged eye lenses. There are two different types of lenses in this image, both of which are rounded and have plastic hooks attached. There are many different lens 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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