Stock Number: 2159-23
Benjamin Martin, a London optician, is credited with making the first eyeglasses that corrected vision in addition to being a reading aid. He published an essay in 1756 in which he explained his theories that the common spectacle then in use was "prejudicial to the eye" because the large lenses allowed too much "light to enter the eye."
Martin made spectacles in which one third of the lens opening was filled with the horn of the Ox and in which the "lens tilted inwards so that the axes of the eye converged on the object of regard."
This frame is made from iron and dates back to the 1750s
The horn insert have shrunk with age
The right insert has opened about 1/32 of an inch
The left insert has a crack that is not yet open
See the image for size and location of the crack
Also, the right temple ring has become unsoldered
This shows in the image
This frame comes complete with its original steel case
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