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Lens

The lens is an ellipsoid structure located in the eyeball. It lies posterior to the iris and anterior to the vitreous body. Moreover, the lens is encircled by the ciliary processes, and is attached to them by the zonular fibres.

The lens is comprised of three main parts: capsule, epithelium and fibers. Although it has many layers, the lens is transparent.

The main function of the lens is to transmit and focus the light onto the retina in order to create clear images of observed objects at various distances. The lens is also the main structure of the accommodation reflex. This reflex is activated when the eye focuses on closer objects. The activation of the reflex pathway leads to the increase of the lens curvature which increases the refraction power of the eye (i.e. eye's focus).

Terminology English: Lens
Latin: Lens
Synonym: Crystalline lens
Location Posterior to iris, anterior to vitreous body
Structure Lens capsule, lens epithelium, lens fibers
Function Trnsmiting and focusing the light onto the retina

Learn the anatomy of the eyeball with the following study unit:

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