Can occur in immature, mature or hypermature stage. By definition, complicated cataracts are lens opacities which occur as a result of intraocular disease. The cataract develops slowly and is often located in the anterior portion of the lens. Usually associated with posterior synechiae, marked thickening of the capsule of the lens, and the formation of a fibrovascular membrane across the pupil and anterior lens capsule. Posterior uveitis can cause posterior polar lens opacities.
First sign is polychromatic luster of the posterior polar subcapsular region.
No posterior synechiae. Large mutton fat KP's. Usually cataract is subcapsular posterior polar which gradually progresses to complete opacification of the lens. Usually the opacity begins posteriorly with polychromatic luster and then spreads to other regions of the lens. Etiology is considered allergic, usually a hereditary tendency.