Cataract surgery is the removal of the natural lens of the eye (also called crystalline lens ) that has developed an opacification, which is referred to as a cataract.

A disadvantage is that a vitrectomy always leads to more rapid progression of a cataract in the operated eye.

Metabolic changes of the crystalline lens fibers over time lead to the development of the cataract and loss of transparency, causing impairment or loss of vision.