eyeglass
Definition
Noun: A single corrective lens, typically for one eye, designed to improve defective vision. It is held in place not by a frame with earpieces, but by the muscles around the eye socket.
Usage
An "eyeglass" is a singular optical device, distinct from a pair of glasses. It is used to correct vision in only one eye, often when the other eye does not require correction or requires a different type of aid.
Examples
- The antique collector found a Victorian eyeglass on a delicate chain.
- After his surgery, he used an eyeglass for reading while his right eye healed.
- A monocle is a type of eyeglass that was once a fashionable accessory.
Advanced Usage
- Historical Context: The term often refers to historical vision aids like the monocle or quizzing glass, which were single lenses held by hand or secured by the eye socket.
- Technical/Medical Context: In optometry, an "eyeglass" can specifically denote a trial lens used during an eye examination to determine the correct prescription.
Variants and Related Words
- Monocle (n): A type of eyeglass for one eye, often associated with formal wear in the past.
- Lorgnette (n): A pair of eyeglasses or opera glasses held by a long handle.
- Spectacles (n): The more common term for a pair of lenses set in a frame for wearing in front of both eyes.
Synonyms
- Monocle
- Single lens
- Corrective lens (when referring to the singular item)
Notes on Meaning
The primary and most specific meaning of "eyeglass" is a lens for one eye. It is crucial not to confuse it with "eyeglasses," which always refers to a pair of lenses. The word is largely historical or technical in modern usage, as single-lens vision correctors are rare today.
Noun
-
lens for correcting defective vision in one eye; held in place by facial muscles
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