About Spectacles

Definition

Spectacles
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Spectacles are made up of lenses fitted in a frame or a mount with sides extending outwards to the ear. Concave lenses are used for myopia, it reduces the blurriness by cancelling out the effects of increased curvature or length of the eyeball.

History

Reading stone
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The first noted invention of spectacles was in 13th century. Before the invention of wearable spectacles, people used what is called a "reading stone". These were polished pieces of glass or precious stones such as Emerald. The idea of using glass to magnify an object is known to have originated in Europe before migrants brought this idea across to China. Over the years, new designs of frames to house the corrective glass or plastic have been developed for comfort and convenience.

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Advantages & Disadvantages

Advantages Disadvantages
They can be regarded as accessories to complement one's fashion style. Spectacles impede on sports performance due to unnecessary movements of the spectacles.
Modern spectacles are relatively durable with lenses made of Polycarbonate and Trivex material, which are very light and shatter-resistant. The frames of the spectacles may block the wearer's peripheral vision.
Spectacles act as a kind of eye protection against flying debris and ultraviolet light rays. Spectacles fog up easily due to condensation resulting from difference in temperature. Thus, obscuring vision.
An accident during activities such as contact sports can cause spectacles to shatter, resulting in serious eye injury.

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Future for Spectacles

There is a possibility of having 'electronic spectacles' in the near-future. The technology involved here uses transparent liquid-crystals deposited on a glass substrate to produce an optical medium with variable refractive-index, based on a programmable optical element that can dynamically alter its characteristics as required by the patient. These electronic spectacles may then provide a customized correction of the refractive anomalies of the patient's eye. This emerging technology, in our opinion, is the future of spectacles.
Quoted from "Electronic Spectacles for 21st Century"