[Monobloc PMMA lenses. Anteroposterior displacement of the implant as a function of the insertion diameter]

Data concerning the biomechanical properties of IOL are rare. A systematic study of these properties was performed in the "laboratoire de Mécanique des Structures" at the "Ecole Centrale de Nantes". The results of the anteroposterior displacement of the optical part of eleven posterior chamber lenses (all PMMA) which were subjected to a diameter reduction, are reported. The deplacement of the implants was very slight and the position of the posterior side was relatively anterior whatever the diameter of insertion. The clinical implications, especially concerning the posterior capsule, are discussed.