Glasses

Glasses, also known as spectacles or eyeglasses are defined as frames, with lense inserts, worn in front of the eyes. Modern glasses are typically supported by pads on the bridge of the nose and by temple arms (sides) placed over the ears. Plastic lenses are common due to their low weight, high scratch resistance, low dispersion, and low transparency to ultraviolet and infrared radiation. Most people these days own many glasses of many types, including corrective lense glasses, safety glasses, sun glasses, sports glasses and more.  Although many people wear glasses for aesthetic or fashion purposes, an unpopular aspect of glasses is their inconvenience. Even through the creation of light frames such as those made of titanium, very flexible frames, and new lens materials and optical coatings, glasses can still cause problems during rigorous sports. Visibility can be significantly reduced by becoming greasy, trapping vapour when eating hot food, swimming, walking in rain or rapid temperature changes (such as walking into a warm building from cold temperatures outside). Scraping, fracturing, or breakage of the lenses require time-consuming and costly professional repair, though modern plastic lenses are almost indestructible and very scratch-resistant.

Glasses Types

Corrective Lens Glasses
Corrective lenses are used to correct refractive errors of the eye by modifying the effective focal length of the lens in order to alleviate the effects of conditions such as nearsightedness (myopia), farsightedness (hyperopia) or astigmatism. Read more on Corrective Lens Glasses.

Safety Glasses
Safety glasses are usually made with shatter-resistant plastic lenses to protect the eye from flying debris. Although safety lenses may be constructed from a variety of materials of various impact resistance...Read more on Safety Glasses.

Sun Glasses
Sunglasses may be made with either prescription or non-prescription lenses that are darkened to provide protection against bright visible light and, possibly, ultraviolet (UV) light. Photochromic lenses, which are photosensitive, darken when struck by UV light. Read more on Sun Glasses.

Sports Glasses
Sports glasses are used by participants in a wide variety of spoting events, mainly for safety purposes.