Eyeglass
Eyeglass
Eyeglass (pronunciation: /ˈaɪˌɡlæs/), also known as spectacles or glasses, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears.
Etymology
The term "eyeglass" is derived from the words "eye" and "glass". The word "eye" comes from the Old English "ēage", while "glass" comes from the Old English "glæs", referring to the material used to make the lenses.
Usage
Eyeglasses are typically used for vision correction, such as with reading glasses and glasses used for near sightedness. Safety glasses provide eye protection against flying debris or against visible and near-visible light or radiation. Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light.
Related Terms
- Lens (optics): A piece of glass or other transparent substance with curved sides for concentrating or disseminating light rays.
- Optician: A person who makes or sells eyeglasses and, in some regions, contact lenses.
- Optometrist: A healthcare professional who provides primary vision care ranging from sight testing and correction to the diagnosis, treatment, and management of vision changes.
- Ophthalmologist: A medical doctor specializing in eye and vision care, who can perform eye surgery.
See Also
External links
- Medical encyclopedia article on Eyeglass
- Wikipedia's article - Eyeglass
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