lens Meaning, definition in Cambridge English Dictionary
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Meaning of "lens" - English Dictionary

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lensnoun [C]

uk   us   /lenz/

lens noun [C] (GLASS)

a curved piece of glass, plastic, or other transparent material, used in cameras, glasses, and scientific equipment, that makes objects seem closer, larger, smaller, etc.: a camera with a zoom lens →  contact lens

lens noun [C] (EYE)

the part of the eye behind the pupil (= the black hole at the front of the eye) that helps you to see clearly by focusing (= collecting) light onto the retina
(Definition of lens from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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