The idea dates back to ancient Egypt where heiroglyphs mention small lenses that made things larger. In 1 AD, Seneca the Younger (tutor of Nero) noted that small letters could be seen larger with a globe or glass bowl filled with water. In 1284, Salvino D'Armante created the first wearable pair. Later improvments include concave lenses by Nicholas of Cusa and dual panel bifocals from Benjamin Franklin
Benjamin Franklin Invented The Bifocal Glasses
Glass lenses, for use as magnifiers or for starting fires, date to about 300 BC, but the first eyeglasses to aid or correct vision were almost certainly invented in 1280 in Florence, Italy by the Dominican friar Alessandro della Spina and / or his friend, the physicist Salvino degli Armati. Prescribed for far-sightedness, the glasses had convex lenses and were worn by Armati, who had injured his eyes while performing light refraction experiments and discovered that it was possible to enlarge the appearance of objects by looking through two pieces of convex glass.It was in the early fourteenth century that concave lenses were used to correct near-sightedness. In fact, Pope Leo X was depicted wearing glasses, with concave lenses, in a 1517 painting by Raphael. Whereas early eyeglasses were made of polished quartz, by the sixteenth century developments in glassmaking made it possible to mass produce them from glass.
Bifocals, the combination of both concave and convex lenses for both types of vision correction, a top lens for distant viewing and a lower lens for reading, were developed around 1760 by the American statesman and inventor Benjamin Franklin.
The history of bifocals is partially in question, but the most likely place that they were invented is in London in the early 1760s, by Benjamin Franklin. Letters that Franklin wrote to George Whatley and others seem to confirm this.
Dr. Frank Sakomoto, a Chicago optometrist came up with the first practical bifocal contact lens.
Benjamin Franklin
benjamen franklin made the first bifocal
Ben Franklin
who invented the bifocal lenses
Bifocal contacts lenses are a better option..:)
The difference between bifocal and multifocal contact lenses is that biofocal contact lenses do not provide so many different angles as multifocal contact lenses do. Biofocal contact lenses do not allow the user to see as good as with multifocal contact lenses.
It is lenses which Benjamin Franklin invented.
One can purchase bifocal contact lenses from eyeglasses stores such as Lenscrafters or Walgreens. One may also purchase from online retailers such as 1800Contacts or Acuvue.
It means you are using a bifocal contact lens that has a bifocal power of about +1.25 to +1.50. A high add would have the bifocal power of about +2.50.
USA. Benjamin Franklin fist invented bifocal lenses to see near or far.
Charles Goodyear is credited with discovering vulcanization of rubber, Benjamin Franklin with the invention of bifocal lenses.
One of the benefits of having bifocal lenses is that they correct astigmatism. The lenses can be worn during most waking hours with few to no problems.
Contact lenses is another way to correct vision besides wearing glasses. I am nearsighted and can't see anything without my glasses. It corrects my vision and I don't have to worry about having my glasses break
It was invented in the early 1500's..
Leonardo Da Vinci in the early 1500's invented contact lenses.