This is for information only, and is not medical advice. The informtion is not intended to replace medical advice offered by medical physicians.

Thursday, July 9, 2009

Spectacles for vision correction, protection and aesthetics

Spectacles or Eyeglass

Spectacles, also referred to as eyeglasses are lenses borne in frames made of plastic or metal worn for various purposes. These eyeglasses could be used for eye protection, vision correction or just for aesthetic purposes.

Eyeglasses for eye protection

Eyeglasses can be used for protection from flying debris, abnormally strong light like those originating from welding or for protection from light from sunlight. Eyeglasses for protection from flying debris are called safety glasses. Eyeglasses for protection from extra strong light are called flash goggles. Eyeglasses for protection from sunlight are called sunglasses. Sunglasses have darkened lenses to provide protection from bright visible light. Sunlight have invisible components including ultraviolet light which can harm the eyes and contribute to the formation of cataract eventually leading to blindness.

Eyeglasses for vision correction

Not all have perfect vision. Impaired vision include myopia (short-sightedness), hyperopia (long-sightedness) or astigmatism. Such eyeglasses which have lenses with power prescribed by opticians are referred to as prescription glasses. Prescription glasses with lenses which are darkened for protection against strong sunlight are called prescription sunglasses.