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The mechanisms by which retinal holes or tears form are not fully understood yet.
The patient's head is then positioned so that the bubble rests against the retinal hole.
Patients may have to keep their heads tilted for several days to keep the gas bubble in contact with the retinal hole.
Once blood is removed, photocoagulation with a laser can shrink unhealthy blood vessels or seal retinal holes.
During rhegmatogenous retinal detachment, fluid from the vitreous humor enters a retinal hole.
This strict positioning requirement makes the treatment of the retinal holes and detachments that occurs in the lower part of the eyeball impractical.
The bands push the wall of the eye inward against the retinal hole, closing the break or reducing fluid flow through it and reducing the effect of vitreous traction thereby allowing the retina to re-attach.
It is another method of repairing a retinal detachment in which a gas bubble (SF or CF gas) is injected into the eye after which laser or freezing treatment is applied to the retinal hole.
Predisposing factors for Postoperative PVR are preoperative PVR, aphakia, high levels of vitreous proteins, duration of retinal detachment before corrective surgery, the size of the retinal hole or tear, intra-ocular inflammation, vitreous hemorrhage, and trauma to the eye.
Słownik medyczny