contact lens
From Longman Dictionary of Contemporary Englishcontact lensˈcontact ˌlens noun [countable] MHa small round piece of plastic that you put on your eye to help you see clearlyExamples from the Corpuscontact lens• But Tucker was fine; he had just lost a contact lens.• A contact lens holder - I recognized it, Mum wears them - still with the lenses in them.• Amongst these are contact lens wetting solutions, comfort drops and artificial tears, which, perhaps surprisingly, have similar compositions.• But in infant monkeys wearing an opaque contact lens, this changes.