Secondary vitrectomy for the treatment of macular holes occurring after vitrectomy.

Tangential foveal traction by the posterior vitreous cortex is regarded as the main cause of full-thickness macular holes. This report documents two cases of full-thickness macular holes that developed after vitrectomy for other diseases in the apparent absence of the cortical vitreous traction. Autologous serum with pars plana vitrectomy was used to treat these cases. Anatomic closure of the holes was achieved. Macular holes developing after vitrectomy may have an etiology other than tangential vitreous traction, and secondary vitrectomy is useful in treating such holes.