Vossius ring
Vossius Ring
Vossius ring (/ˈvɔːsiəs rɪŋ/) is a medical term used in ophthalmology to describe a circular deposit of pigment on the anterior surface of the lens following a blunt eye trauma. The term is named after the Dutch ophthalmologist Gerardus Vossius who first described the condition.
Etymology
The term "Vossius ring" is derived from the name of the Dutch ophthalmologist Gerardus Vossius (1851–1919), who first described the condition in detail. The word "ring" refers to the circular shape of the pigment deposit on the lens.
Description
A Vossius ring is typically observed following a blunt trauma to the eye. The trauma causes the iris to be pushed against the lens, leading to the release of pigment from the posterior surface of the iris. This pigment then adheres to the anterior surface of the lens, forming a ring-shaped deposit.
Related Terms
- Iris: The colored part of the eye, which controls the diameter and size of the pupil and thus the amount of light reaching the retina.
- Lens: A transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.
- Eye trauma: Any injury to the eye. This can range from minor surface scratches to severe trauma resulting in permanent loss of vision.
- Pigment: A material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption.
External links
- Medical encyclopedia article on Vossius ring
- Wikipedia's article - Vossius ring
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