For some delegates, currently not allowed to use diagnostics in their own countries, this was the first time they had ever seen the anterior vitreous face
with a slit lamp.
Up to one quadrant of subretinal fuid may be present Group E -- very high risk Eyes that have been destroyed anatomically or functionally by the tumour Eyes with one or more of the following: irreversible neovascular glaucoma, massive intra-ocular haemorrhage, aseptic orbital cellulitis, tumour anterior to the anterior vitreous face
, tumour touching the lens, difuse infltrating retinoblastoma, phthisis and pre-phthisis
This occurs from tangential traction caused by anterior to posterior contraction of the vitreous face
at the macula.
Indeed, it is the nonseparation of a contracting vitreous face
, leading to tangential traction across the fovea that is thought to be the cause of the condition.
These are easily and successfully treated by lysing the vitreous face
, in a similar manner to YAG capsulotomy for treatment of posterior capsular opacification (PCO).
Sometimes the posterior vitreous face
can be seen 'flapping' in the vitreous when the patient moves their eye, but this can sometimes be difficult to tell in ageing vitreous gel from other vitreous floaters.