title: Red filters in the esophagoscopic diagnosis of esophageal varices.
mesh_terms: D000221:Adaptation, Ocular; D003116:Color; D004932:Esophageal and Gastric Varices / Q000175:diagnosis*; D004945:Esophagoscopy; D005374:Filtration; D006801:Humans; D007909:Lenses