Lens

1. a piece of curved glass or other transparent material used to focus or disperse light rays

“We see the world through the lens of all our experiences; that is a fundamental part of the human condition.”

– Madeleine Kunin (1933 – )

2. a part of the eye that focuses light rays to form an image on the retina

“The cornea and lens form an optical apparatus of remarkable perfection.”

– Santiago Ramón y Cajal (1852 – 1934)