In most vitrectomy operations (retinal detachment, full thickness macular holes etc.), ensuring that a posterior vitreous detachment (PVD) is present is essential. In other cases the need to elevate the posterior hyaloid needs to be balanced against the risk of inducing an iatrogenic retinal tear or detachment. This is more likely to occur if the posterior hyaloid is firmly adherent.
Induction of a PVD may be more difficult under the following circumstances.
In contrast, elderly, pseudophakic patients with epiretinal membranes are more likely to already have a PVD.
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