Glasses
Glasses
Glasses (pronunciation: /ˈɡlɑːsɪz/), also known as eyeglasses or spectacles, 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The term "glasses" comes from the material from which the lenses were originally made, glass. The term "spectacles" is derived from the Latin word "spectaculum" which means "show, spectacle".
Types of Glasses
There are various types of glasses, each designed for specific needs:
- Reading Glasses: Used for individuals with presbyopia, a condition that causes difficulty in reading small print or close-up objects.
- Prescription Glasses: Custom-made glasses prescribed by an optometrist or ophthalmologist to correct vision problems such as myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia.
- Sunglasses: Glasses with darkened lenses that protect the eyes from harmful ultraviolet (UV) rays.
- Safety Glasses: Protective eyewear that prevent foreign objects or chemicals from striking the eyes.
Related Terms
- Lens (optics): A piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays.
- Optician: A person who makes and sells eyeglasses and contact lenses for correction of vision.
- Optometry: The practice or profession of examining the eyes for visual defects and prescribing corrective lenses.
- Ophthalmology: The branch of medicine concerned with the study and treatment of disorders and diseases of the eye.
External links
- Medical encyclopedia article on Glasses
- Wikipedia's article - Glasses
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