Feeds:
Posts
Comments

Posts Tagged ‘Leonardo Da Vinci’

Contact lenses are tiny removable lenses that are worn in contact with the eye (they rest directly on the cornea of the eye). Like glasses, they improve the wearer’s vision. This type of lens was envisioned (but not actually made) by Leonardo da Vinci (around 1508) and later by René Descartes (around 1636-1637).

Contact lenses were invented and made in 1887 by the German physiologist Adolf Eugen Fick (1829-1901). He first fitted animals with the lenses, and later made them for people. These lenses were made from heavy brown glass and were 18-21mm in diameter. The lenses were improved by August Muller in 1889; he made lenses that corrected myopia (nearsightedness).

Plastic contact lenses were first made by the California optician Kevin Tuohy in 1948. Soft contact lenses (hydrophilic lenses) and gas-permeable lenses (which let oxygen pass through the lens and to the cornea) were invented in the 1970s.

Read Full Post »