King from 871-901 A.D. The Danes were neighbors of the Norwegian Vikings, and like them were fond of the sea and piracy. They plundered the English coasts for more than a century; and most of northern and eastern England became for a ... Read more of Alfred the Great at Biographical.caInformational Site Network Informational
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Lens





Category: Diseases of The Eye and Ear

A lens is made of glass and prisms graded in strength, one surface
curved, and has the power of refracting or changing the direction of the
rays of light. A prism is wedge-shaped and bends rays of light towards its
base. A great many people are troubled with their eyes, much more than
years ago. We even see little children wearing glasses. It is unfortunate,
but true, that even more children and grown people should wear them.
Fitting glasses is an art in itself. It takes more ability to fit glasses
well than it does to operate well. Poorly-fitted glasses are not only
annoying to the wearer, but dangerous. Glasses rest the eyes, not tire
them. When the eyes water and feel tired or strained, even after using
them but little, glasses are needed. Headaches are frequently caused by
the eye strain. When glasses are needed it does not pay to put off getting
them and the person needing them should go to one competent to properly
fit them. A great many eyes are hard to fit, and they need not only
ability to fit them well, but time and attention must be given to fitting
them properly.





Next: SQUINT OR STRABISMUS

Previous: INFLAMMATION OF THE RETINA FROM BRIGHT'S DISEASE



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