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. Cf. soft lens.
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hard lens,
a contact lens made firm plastic that adheres to the eye by suction: ยป
Hard lenses are advisable for those with severe astigmatism or cataracts (Alexandra Penney).
Useful english dictionary. 2012.