Complete PVD: Separation of vitreous from the retina and optic disc.
Incomplete PVD: Full or partial separation from fovea but residual attachment to optic nerve and mid-peripheral retina.
Vitreoschisis: or anomalous PVD whereby there is liquefaction (synchysis) more than vitreoretinal separation.
Vitreous syneresis: Collapse of the vitreous gel. Goes hand in hand with synchysis in the gradual process of vitreous separation of PVD.
Useful information about PVD:
- PVD starts around fovea.
- Vitreous is most strongly attached at vitreous base and optic disc.
- Weiss Ring = separation of vitreous from optic disc evident on slit lamp examination.