Jean-Paul Amar (Cannes, France)

Whatever the technique used during vitrectomy, physical law will determine the quality and the safety of the PPV. In fact, to perform a complete vitrectomy, some principles are mandatory:

• We have to control the flow rate of the cutting system.
• In order to decrease the gradient of pressure and this way the dangerous movements of the retina, the occlusion during the closure of the vitrectomy probe needs to be as short as possible.
• The main factor for a complete and secure PPV is to work in an iso-flow-rate condition. That means an equal infusion flow-rate and aspiration flow-rate whatever the viscosity of the endocular liquid, vitreous gel or BSS, is.