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hard lens

noun
1.
a contact lens of rigid plastic or silicon, exerting light pressure on the cornea of the eye, used for correcting various vision problems including astigmatism.
Compare soft lens.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hard lens

hard lens

noun
1.
a rigid plastic lens which floats on the layer of tears in front of the cornea, worn to correct defects of vision Compare gas-permeable lens, soft lens
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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