Gonioscopy

Part of speech: noun

Definitions

1. A specific eye examination method that utilizes a specialized lens to observe the angle of the anterior chamber, aimed at assessing glaucoma and related ocular conditions linked to fluid drainage
2. This procedure employs a particular lens to inspect the anterior chamber's angle, primarily to determine the health of ocular structures and diagnose glaucoma-related issues
3. A method involving a specialized lens that allows observation of the anterior chamber angle, primarily used to evaluate glaucoma and other conditions affecting fluid drainage in the eye

Etymology: Gonioscopy is a compound built from two Greek elements, and the first one is a word with a geometric sense. "Gōnía" meant "angle" or "corner" in ancient Greek, and it is the same stem that gives English "pentagon" and "polygon," where the Greek sense of "angle" survives in the shape's name. The second element, "-scopy," comes from "skopeîn," meaning "to look at" or "to examine," from the verb "skopéō," related to "skopós," a watchman or observer. So the term literally describes looking at an angle. That angle is the one in the eye where the iris meets the cornea, the anterior chamber's angle, and it is precisely the spot that matters in glaucoma. Because light cannot pass straight through the cornea's edge to be seen, an ophthalmologist uses a specially designed lens to view the structures there. The Greek vocabulary fits the procedure neatly: the old word for a corner now names the narrow region of the eye that the examination exists to inspect.