lens 
/ˈlɛnz/ noun
plural lens·es /ˈlɛnz/ noun [count] 1 : a clear curved piece of glass or plastic that is used in eyeglasses, cameras, telescopes, etc., to make things look clearer, smaller, or bigger
▪ glasses with thick lenses ▪ a camera lens ▪ Make sure the lens of the microscope is clean. — see picture at camera; see also contact lens, fish-eye lens, objective lens, telephoto lens, zoom lens 2 : the clear part of the eye that focuses light to form clear images
▪ glasses with thick lenses ▪ a camera lens ▪ Make sure the lens of the microscope is clean. — see picture at camera; see also contact lens, fish-eye lens, objective lens, telephoto lens, zoom lens
