Red Out

A homogeneous red-orange colour seen by GI endoscopy when the intestinal mucosa directly covers the endoscope’s lens, allowing only the passage of light across the blood vessel-rich mucosa; red-out can be corrected by a puff of air to push the mucosa away from the visual field
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive ?
He then uses the temporary loss of memory from "graying out" (which occurs as positive G forces cause blood to pool in the lower extremities) to explain why Bader's memory while experiencing negative G's (which causes red out's as blood pools in the eyes) while trying to bail out, is suspect and should, thus, be discounted.
He reminded me of her feat when the handicapper at the time thought she had won enough, so within 10 days Red Out had to run three times.
Thanks Andy for the photo of Red Out and for the press clippings, I will treasure them.