OCT Guided Trans Nasal Imaging of the Small Intestine in Adults

The investigators have developed a device that can image the duodenum (the first part of the small intestine). The device consists of a thin, flexible tube with a small internal camera inside of it that takes high-resolution images of the gastrointestinal tract. The device will be introduced through the nose and then advanced into the stomach and duodenum. Participant tolerability, imaging quality and the optimal imaging technique will be evaluated. The results of this study will be used as the basis for a larger study to be conducted at the Aga Khan University Hospital in Pakistan where subjects with suspected or diagnosed EED will be imaged.