the first pair of eyeglasses were made in the 13th century.
the first pair of eyeglasses were made in the 13th century.
when were the first pair of eyeglasses made?
13th century
between the 11th and 13th century "reading stones" were invented. often used by monks to assist in illuminating manuscripts, these were primitive plano-convex lenses initially made by cutting a glass sphere in half. as the stones were experimented with, it was slowly understood that shallower lenses magnified more effectively. around 1286, possibly in pisa, italy, the first pair of eyeglasses were made, although it is unclear who the inventor was.
history of optics
chicken eyeglasses









































chicken eyeglasses, also known as chickens specs, chicken goggles, generically as pick guards and under other names, were small eyeglasses made for chickens intended to prevent feather pecking and cannibalism. they differ from blinders as they allowed the bird to see forward whereas blinders do not. one variety used rose-colored lenses as the coloring was thought to prevent a chicken wearing them from recognizing blood on other chickens which may increase the tendency for abnormal injurious behavior. they were mass-produced and sold throughout the united states as early as the beginning of the 20th century.









































section::::description and purpose.
chicken eyeglasses