Glasses, spectacles, or eyeglasses are frames bearing lenses worn in front of the human eyes, sometimes for purely aesthetic reasons but normally for vision correction or eye protection. Special glasses are used for viewing three-dimensional images or experiencing virtual reality. Modern glasses are typically supported by pads on the bridge of the nose and by temples placed over the ears. Historical types ...

Including:

• Glasses - History
• Glasses - Corrective glasses
• Glasses - Safety glasses
• Glasses - Sunglasses
• Glasses - Special glasses
• Glasses - Conditions glasses are used to correct
• Glasses - Variation in glasses
• Glasses - Glasses as a fashion accessory
• Glasses - Other names for glasses

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Glasses were possibly invented in northern Italy, most likely in the late 1280s. The identity of the original inventor is unknown, although a possible source is the Arabs, who may have had magnifying lenses in the 10th century. In 1676, Franciscus Redi, a professor of medicine at the University of Pisa, wrote that he possessed a 1289 manuscript whose author complains that he would be unable to read or write were it not for the recent invention of glasses, and a record of a sermon given in 1305, in which the speaker, a Dominican monk named Fr ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - History

Glasses can be very simple. Magnifying lenses for reading that are used to treat mild hypermetropia and presbyopia can be bought off the shelf, but most glasses are made to a particular prescription, based on degree of myopia or hypermetropia combined with astigmatism. Lenses can be ground to specific eyes, but in most cases standard off-the-shelf prescriptions suffice, but require custom-fitting to particular frames. As people age, their ability to focus is lessened and many decide to use multiple-focus lenses, bifocal or even trifoc ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - Variation in glasses

Glasses are often regarded as unattractive, and many people prefer to wear contact lenses for that reason. Contact lenses also provide much improved peripheral vision. On the other hand, many people are attracted to people who wear glasses, and glasses are available in a wide range of styles, materials, and even designer labels. Glasses can be a major part of personal expression, from the extravagance of Elton John and Dame Edna Everage, from Groucho Marx to John Denver to Lisa Loeb all the way to the varied pr ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - Glasses as a fashion accessory

Main article: Sunglasses Sunglasses may be made with either prescription or non-prescription (i.e. plano) lenses that are darkened to provide protection against bright visible light. Good sunglasses should also protect against ultraviolet light. Due to changes in the atmosphere, ultraviolet levels are much higher than in the past and ultraviolet protection for eyes and skin is even more important. It is possible to have lenses that look very dark and yet offer little ultraviolet protection. Sunglasses vary greatly and ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - Sunglasses

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 that vary in impact resistance, certain standards suggest that they maintain a minimum 1mm thickness at the thinest point regardless of material. Safety glasses can vary in the level of protection they provide. For example, those used in medicine may be expected to protect against blood splatter while safety glasses in a factory might have stronger lenses and a stro ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - Safety glasses

The illusion of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses create the illusion of three dimensions when viewing specially prepared images. The classic 3D glasses have one red lens and one blue lens. 3D glasses made of cardboard and plastic are distributed at 3D movies. Another kind of 3D glasses uses polarized filters. One kind of electronic 3D spectacles uses electronic shutters. Virtual reality glasses and helmets have separate video screens for each eye and a method for de ...

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Glasses, Glasses - History, Glasses - Corrective glasses, Glasses - Safety glasses, Glasses - Sunglasses, Glasses - Special glasses, Glasses - Conditions glasses are used to correct, Glasses - Variation in glasses, Glasses - Glasses as a fashion accessory, Glasses - Other names for glasses

Read more here: » Glasses: Encyclopedia II - Glasses - Special glasses