From Longman Dictionary of Contemporary Englishhorn-rimmed glasses/spectacleshorn-rimmed glasses/spectaclesglasses with frames made of plastic that looks like horn → horn-rimmed
Examples from the Corpus
horn-rimmed glasses/spectacles• He had thick horn-rimmed glasses, a heavy shadow and rather bad teeth.• Eventually Johnny drew him to one side with a shock-haired young reporter who sported horn-rimmed glasses and a velvet bow-tie. 