Lens Anatomy
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The lens is located behind the iris, in front of the jelly-like vitreous. It is normally clear, but becomes yellow as it ages. Structure -It has epithelium and fibers arranged inside a covering capsule. The central compactly arranged fibers of the lens form the 'nucleus', while the periphery is called the cortex. The lens is suspended in its position by suspensary ligaments or zonules. The zonules are connected to the ciliary body. The ciliary body controls the tension in the zonules. Accordingly the lens capsule becomes taut or relaxes, thus changing the thickness of the lens, thus, the eye becomes focused for distance or near. This is called 'accomodation'. The elasticity of the lens capsule is lost with aging, thus causing presbyopia. Dislocated lens -When the lens is displaced from its normal anatomical position, it is called dislocated lens. It occurs in certain conditions like Marfan's syndrome. The management requires assessment of the condition by the ophthalmologist. |
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