a curved piece of glass or plastic that makes things look larger, smaller or clearer when you look through it 透镜；镜片 
a pair of glasses with tinted lenses 一副有色镜片眼镜
Extra ExamplesPut your hand in front of your right lens and just look through your left lens. 把你的手放在右边的镜片前，只用左边的镜片看。 She wears glasses with very thick lenses. 她戴的眼镜镜片很厚。
Oxford Collocations Dictionaryadjective- strong
- thick
- coloured/colored
- …
- cap
- cover
- through a/the lens
-
a piece of equipment that is part of a camera, containing one or more lenses a camera with an adjustable lens 带有可调镜头的照相机 a view of Mount Kilimanjaro as seen through Eddie's camera lens 透过埃迪的摄影机镜头看到的乞力马扎罗山风景 a lens cap/cover 镜头帽；镜头盖 a long-lens shot of a rare bird 用长焦镜头拍摄的珍禽照片
- (informal)
a contact lens (= a small round piece of thin plastic that you put on your eye to help you see better) - (
anatomy 解剖学 the clear part of the eye, behind the pupil, that focuses light so that you can see clearly （眼球的）晶状体 
Word Originlate 17th cent.: from Latin, ‘lentil’ (because of the similarity in shape).