Sunglasses
Sunglasses
Sunglasses or sun glasses (/sʌnˈɡlɑːsɪz/) are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened.
Etymology
The term 'sunglasses' is a compound word deriving from 'sun' and 'glasses'. The word 'sun' comes from the Old English 'sunne', and 'glasses' comes from the Latin 'glaucus' meaning 'gleaming, gray', referring to the reflective property of the lenses.
History
The concept of sunglasses dates back to Roman times, with emperors like Nero watching gladiator fights through polished gems to reduce glare. However, the modern form of sunglasses only started to appear in the 20th century when film actors used them to shield their eyes from the bright studio lights. This led to sunglasses becoming a popular fashion accessory.
Types of Sunglasses
There are several types of sunglasses, each designed for specific situations and needs. These include Polarized Sunglasses, Mirrorshades, Aviator Sunglasses, Wayfarer Sunglasses, and Clip-on Sunglasses.
Health and Protection
Sunglasses offer protection against excessive exposure to light, including its visible and invisible components. The most widespread protection is against ultraviolet radiation, which can cause short-term and long-term ocular problems such as photokeratitis, snow blindness, cataracts, pterygium, and various forms of eye cancer.
Fashion
Sunglasses have long been associated with celebrities and film actors primarily from a desire to mask their identity or to add mystery to their appearance. Since the 1940s sunglasses have been popular as a fashion accessory, especially on the beach.
External links
- Medical encyclopedia article on Sunglasses
- Wikipedia's article - Sunglasses
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