The lens is an important
part of the structure
of the eye.
This lens is a transparent structure enclosed in a
thin transparent capsule. It is located behind the pupil of
the eye and encircled by the ciliary
processes - that slightly overlap
its edges.
The lens of the eye helps to refract light travelling through the eye
(which first refracted by the cornea). The lens focuses light into an
image on the retina. It is able to do this because the shape of the lens
is changed according to the distance from the eye of the object(s) the
person is looking at.
This adjustment of shape of the lens is called
accomodation and is achieved by the contraction and
relaxation of the ciliary
muscle. The Structure of the Lens
The capsule of the lens is a transparent, brittle,
yet highly elastic membrane.
This capsule is thicker in front of the
lens than behind it
The lens itself is a transparent, biconvex body of
approx. 9-10 mm diameter and approx. 4 mm from front to back.
The basic
structure of the lens is composed of concentric layers.
This page is about the lens that is an integral part of the human eye,
as opposed to "contact lenses" used by many people in place of
spectacles. For information about contact lenses, visit www.yourlenses.co.uk.
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