source(google.com.pk)Glasses Lens Biography
In 1784, Ben Franklin developed bifocal glasses. He was getting old and was having trouble seeing both up-close and at a distance. Getting tired of switching between two types of glasses, he devised a way to have both types of lenses fit into the frame. The distance lens was placed at the top and the the up-close lens was placed at the bottom.
In 1784, Ben Franklin developed bifocal glasses. He was getting old and was having trouble seeing both up-close and at a distance. Getting tired of switching between two types of glasses, he devised a way to have both types of lenses fit into the frame. The distance lens was placed at the top and the the up-close lens was placed at the bottom.
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
Glasses Lens
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