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.
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