In this exercise, treatment is taught for retinal detachment. In first stage Heavy per fluorocarbon (PFCL) may be used to help reattach the retina. It is injected into the vitreous cavity over the posterior retina. As PFCL is heavier than water, it forces sub retinal fluid peripherally and then forces it out of the retinal break(s), at the same time pressing the retina against the wall of the eye.
Vitrectomy for routine retinal detachment usually includes infusion of air to internally tamponade the retina. In most cases, surgeons begin the air infusion while the PFCL remains posterior to the equator and/or retinal breaks. In this situation, the air pushes residual sub retinal fluid toward the break from the front of the eye, while the PFCL pushes it toward the break from the back, forcing it out of the break. After the anterior retina is completely flat, the PFCL is aspirated as the air bubble expands to fill the vitreous cavity. Retinal breaks are treated after the retina is internally reattached. This is performed with laser photocoagulation through an endoprobe.