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'Silly Old Farts'

Stuff about specs

The first device of this kind was probably invented by Roger Bacon in the 13th cent. although similar devices are believed to have existed in ancient times in China and in the Mediterranean civilizations. Early forms were crude and clumsy and were not improved until the 18th cent. when the grinding of lenses was first based upon the principles of light refraction. Lenses are made of clear or rock crystal glass or plastic ground to suit the defect of the eye. Concave glass is used for nearsightedness, so that the rays of light are diverged. Convex lenses are used for farsightedness, so that the light rays are converged.

 

My Face In The Mirror
Isn't Wrinkled or Drawn
My house Isn't Dirty
The Cobwebs are Gone
My Garden Looks Lovely
And So Does My Lawn
I think I might Never
Put My Glasses Back On