The Shearing-style intraocular lens and the posterior chamber.

We observed the Shearing-style intraocular lens in human cadaver eyes and in dog eyes. In human cadaver eyes the lens loops rest in the ciliary body sulcus without exerting undue pressure; the only major problem occurred when the posterior capsule was torn and a loop found its way into the pars ciliaris of the ciliary body or into the vitreous base. Seven Shearing-style lenses were implanted in four dogs: six-month preliminary histopathology showed four of these lenses to be well tolerated with abundant synechiae formation around the loops. Two eyes exhibited loop pressure necrosis due to slight lens displacement.