FALSELY NONRECORDABLE FLASH VISUAL-EVOKED CORTICAL POTENTIALS IN A DIABETIC EYE WITH SEVERE VITREOUS HEMORRHAGE

The examination of visual evoked cortical potentials (VECPs) prior to vitrectomy has been proposed for selection of patients with good chanc es for a favorable outcome following surgery. A missing single flash V ECP has been considered a contraindication for further surgical treatm ent. A 64-year-old woman with proliferative diabetic retinopathy suffe red from an intensive vitreous hemorrhage in one eye. Preoperatively, the flash VECP was nonrecordable. Intraoperatively, a dense vitreous h emorrhage and retrohyaloidal blood was found. The retina was attached. Postoperatively, the flash VECP was similar in both eyes with normal latencies. The visual acuity improved from light perception to 0.05. S evere vitreous hemorrhage may interfere with preoperative VECP recordi ngs. A nonrecordable VECP has to be judged cautiously so as to prevent false-negative responses in eyes that could regain vision following v itrectomy and removal of the hemorrhage.