bifocals
noun [ plural ] uk/ˌbaɪˈfəʊ.kəlz/ us/ˌbaɪˈfoʊ.kəlz/
远视近视两用的(双光眼镜)
glasses with lenses that are divided into two parts. The upper half is for looking at things far away and the lower half is for reading or for looking at things that are near.