📒 a curved piece of glass or plastic that makes things look larger, smaller or clearer when you look through it
📒 a piece of equipment that is part of a camera, containing one or more lenses
📒 a contact lens (= a small round piece of thin plastic that you put on your eye to help you see better)
📒 the clear part of the eye, behind the pupil, that focuses light so that you can see clearly