title: Pars plana virectomy. Preoperative evaluation.
abstract: We have outlined the essential considerations in evaluating patients for closed vitrectomy and have attempted to show the importance of each. In general, we recommend closed virectomy under the following conditions: (1) vitreous opacities showing no resolution after six months of observation, (2) vision which is worse than 20/200 but has at least light perception with accurate projection, (3) there is no rubeosis iridis or glaucoma, (4) ultrasonography, ERG, and VER reveal a functional retina and optic nerve, and (5) the benefit outweighs the risk of surgery.
mesh_terms: D004569:Electroencephalography; D004596:Electroretinography; D005071:Evoked Potentials; D005128:Eye Diseases / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery; D005654:Fundus Oculi; D006068:Gonioscopy; D006801:Humans; D009778:Occipital Lobe / Q000503:physiopathology; D012160:Retina / Q000503:physiopathology; D012164:Retinal Diseases / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery; D014463:Ultrasonography; D014787:Vision Tests; D014822:Vitreous Body / Q000601:surgery*