Study finds, Prevalence and predictive factors for posterior
A Study was conducted to report the prevalence of posterior vitreous attachment (PVA) in patients with idiopathic epiretinal membrane (iERM) and to determine associated preoperative predictive factors.

Retrospective observational case series of 408 eyes who underwent surgery for iERM without vitreomacular traction was done. The status of the posterior hyaloid was assessed intraoperatively. Predictive factors were analysed using univariate and multivariate logistic regression. The effect of PVA on the anatomical and functional outcomes of surgery was also evaluated.

--82 eyes were found to have an undetached posterior hyaloid during vitrectomy.

--In multivariate analysis, axial length (AL) and lens status were strongly associated with the posterior vitreous status.

--The odds of having a PVA decreased by a factor 0.81 per mm of AL.

--Phakic eyes had a 2.88-fold increased risk of exhibiting PVA compared to those with previous cataract extraction.

--The presence of PVA did not have any effect on postoperative anatomical and functional outcomes.

--In contrast, eyes with shorter axial length, low preoperative visual acuity and disruption of the ellipsoid zone exhibited worse visual recovery were found.

Finally, 20.1% of the eyes underwritten with vitrectomy for iERM were observed with PVA. Shorter AL and phakic condition in these eyes were important predicting PVA variables. The morphological characteristics and surgical forecast for PVA iERMs, however, were not different from those with posterior glass separation.