hard lens

hard lens

noun
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. 2012.
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Hard lens is always a great word to know.
So is ninnyhammer. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a fool or simpleton; ninny.
Collins
World English Dictionary
hard lens
 
n
gas-permeable lens Compare soft lens a rigid plastic lens which floats on the layer of tears in front of the cornea, worn to correct defects of vision

Collins English Dictionary - Complete & Unabridged 10th Edition
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