Lens Lens List of Sesame Street animators A lens is:

a part of the eye
an optical device that may be used in a camera or in a Telescope; see Lens (optics) or @ Lenses.
an optical device which is an arrangement of abovementioned lens; see Photographic lens and Zoom lens.
the genus of the Lentil
a science-fictional alien device in E. E. Smith's Lensman series, which gives its bearer telepathic and other abilities.
a Gravitational lens
a Metaphor for a Point of view
a geometric shape formed from two arcs

There are also places called Lens:

as well as Racing Club de Lens, a football club from the French city listed above.