NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,957 terms related to cancer and medicine.

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lens
(lenz)
A clear disk that focuses light, as in a camera or microscope. In the eye, the lens is a clear, curved structure at the front of the eye behind the pupil. It focuses light rays that enter the eye through the pupil, making an image on the retina (light-sensitive layers of nerve tissue at the back of the eye).