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Lens (optics), an optical element. See also , and:

Lens (anatomy), a part of the eye

Corrective lens for vision correction

Photographic lens, a special type of lens used in a camera. See also

Sunglasses' lenses, which are light-attenuating elements

Hence:

Gravitational lens, an astronomical effect

Electrostatic lens, a device used to focus or collimate electron beams

a metaphor for a point of view

a science-fictional alien device in E. E. Smith's Lensman series, which gives its bearer telepathic and other abilities

Lens (genus), the genus of the lentil plant

Lens (geometry), a geometric shape formed from two arcs

Lens (geology), a body of ore or rock that is thick in the middle and thin at the edges

Lens, Pas-de-Calais, France

RC Lens, its football (soccer) club

Lens, Belgium

Lens, Valais, Switzerland

Louis Lens, Flemish rose breeder

Laser Engineered Net Shaping, a rapid prototyping technology capable of building fully-dense metal parts