Who invented Bifocal Lens?

Option C

As Benjamin Franklin aged, his vision, which had never been great, deteriorated even further. Like many of the instances in his life when an ongoing challenge presented itself, Franklin devised an invention that would help him to see long distances and be able to continue his favorite hobby, reading. For Ben Franklin, spectacles were not enough; he described his invention as "double-spectacles." The new version of Ben Franklin eyeglasses would come to be known as bifocals. The process of their invention was quite simple. In 1784, Franklin wrote to his optician and made a request: take both his long distance glasses and his reading glasses, slice their lenses in half and then suture the lenses together with the reading lenses on the bottom and the long distance glasses on the top. Franklin would be able to avoid the hassle of switching glasses while he moved between reading and walking about. There is further evidence from other Founding Fathers that Franklin had fashioned his own pair of these "double spectacles" decades before.