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The lens in the eye provides the means of focusing an image on the retina. The lens is a clear, bi-convex structure that sits behind the iris supported by the suspensory ligaments. It has no blood supply and obtains its supply of nutrients from the fluid surrounding it, the aqueous humour in the anterior chamber and the vitreous hunour in the posterior chamber. The shape of the lens can be altered by changing the tension in the ciliary muscle which surrounds it, this allows near objects to be focused clearly. Unfortunately the flexibility of the lens declines with age leading to an inability to see close objects clearly and the need for corrective reading glasses.

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