The word lens is a noun. Lens means (1) a transparent optical device used to converge or diverge transmitted light and to form images, (2) electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons, (3) biconvex transparent body situated behind the iris in the eye; it focuses light waves on the retina, (4) (metaphor) a channel through which something can be seen or understood.
The following articles and web pages elaborate on the word lens.
A lens may be the most important part of a camera, because it forms and focuses photographic images. A filter, affixed in front of a camera lens, can help protect the lens from damage.
Browse this contact lenses retailer directory for information about contact lens retailers in the United States. The photo on this web page depicts a young woman inserting a contact lens into her eye.
Digital cameras enable photographers to quickly shoot quality photos with various lenses. This page includes a discussion of camera lenses and links to selected camera lens manufacturers.