Right homonymous superior quadrantanopia
[Quadrant]-[an-[opia ] The root “quadrant” is based on the Latin "Quadri" meaning "four" and “Quarto”, meaning one fourth. The suffix anopia is composite: “an” meaning “without or absence of”; and opia (or “opsia”) relate to vision, based on the Greek word “οπτασία” (optasía) meaning “sight”. Literally, the term quadrantanopia (or quadrantanopsia) means “absence of sight in a quadrant”.
It can be associated with a lesion of an optic radiation of the internal capsule. While quadrantanopia can be caused by lesions in the temporal and parietal lobes of the brain, it is most commonly associated with lesions in the occipital lobe.
What is interesting are the terms “homonymous” and “heteronymous” used to describe variants of quadrantanopia. Each eye has four quadrants and two visual fields, right and left. A homonymous quadrantanopia means that the patient has lost the vision of a quadrant in the same field in each eye (right-right or left-left), heteronymous means that the patient has lost the vision of a quadrant in the opposite field of each eye (right-left or left-right).
The fact is that the term homonymous means “same name” not same side, and the word heteronymous means “different name”, from the Greek “όνομα” “nym” meaning name. For further confirmation, try finding the meaning of synonym, antonym, acronym, patronymic, etc.
Sources:
1. "The Origin of Medical Terms" Skinner, HA 1970 Hafner Publishing Co.
2. "Medical Meanings - A Glossary of Word Origins" Haubrich, WD. ACP Philadelphia
3. "Dorlands's Illustrated Medical Dictionary" 26th Ed. W.B. Saunders 1994
Note: Google Translate includes an icon that will allow you to hear the pronunciation of the word
Image courtesy of Mudsk, CC0, via Wikimedia Commons.