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Lens (Vision)| |
Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. |
The lens or crystalline lens is a component of the eye. In concert with the cornea, it refracts light, focussing it onto the retina. The lens is clear and flexible; its curvature is controlled by ciliary muscles. By changing the curvature of the lens, one can focus the eye on objects at different distances from it. The lens is about 5 mm wide and has a diameter of about 9 mm for an adult human (though these figures can vary). The lens is included into the capsular bag, maintained by the zonules of Zinn. Diseases of the eye - A cataract is when the normally transparent crystalline lens develops opacities and leads to blurry vision.
See also
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