The Displaced Lens

The ocular lens is a biconvex structure placed between the iris and vitreous. It is attached to the ciliary body by the zonular fibres which are O.5~m. in length. The zonule forms a ring which is roughly triangular on meridional sec tion. The base of this triangle is concave and occupies the equator and portions of the ante rior and posterior surfaces of the lens. The lens and zonular fibres thus form a diaphragm which divides the eye into an anterior portion containing aqueous and a posterior portion containing vitreous. The adult lens is 9-10mm. in diameter and its thickness varies between 4-5mm., depending on accommodation

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