An endoscope is used to view the esophagus and stomach.
a diagnostic procedure that is performed to view the esophagus, stomach, and duodenum (part of the small intestine).
The special instrument used to view the esophagus, stomach, and duodenum during an esophagogastroduodenoscopy (EGD) is called an endoscope. This flexible, tube-like instrument is equipped with a light and camera, allowing physicians to visualize and assess the mucosal lining of these structures for abnormalities or diseases. Additionally, the endoscope may be used to perform minor procedures, such as biopsies or the removal of polyps.
instrument used to view the eye
A microscope.
The term "esophagogastroduodenoscopy" can be divided into several component parts: "esophagus" (the tube connecting the throat to the stomach), "gastro" (referring to the stomach), "duodeno" (referring to the duodenum, the first part of the small intestine), and "scopy" (meaning to view or examine). Together, these parts describe a procedure that involves examining the esophagus, stomach, and duodenum using a flexible tube with a camera.
To view things from far away is called a binocular
Retinascope
our naked eyes...
periscope
The medical term for an instrument used to view small objects is "microscope." It is commonly used in various medical fields for examining cells, tissues, or microorganisms at a magnified level.
An optical telescope is the simplest instrument to view the heavens.
There are many. The general term would be optical instruments