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Secondary cataract is due to abnormalities in the nutrient matter supplied to the lens owing to disease of the ciliary body, choroid or retina.

It is supposed that the muscular substance of the ciliary body and processes changes, by its contraction, the inclination of the crystalline lens.

During the acute attack, the vitreous may become slightly turbid by transudation of serum from the vessel of the ciliary body and the chorioid and may become filled with fibrin.

The ciliary body connects the choroid to the circumference of the iris.

The pupil, covered by the unabsorbed remains of the pupillary membrane, is occluded by a deposition of inflammatory substance, occasioned by inflammation of the ciliary body.