Contact lens is a fashionable choice for people whose eyesight needs to be corrected at present, and its real development history has been one hundred years.
1508, Italian scientist leonardo da vinci first described that a glass jar filled with water was placed in front of the cornea, and the optical function of the cornea was replaced by the glass surface.
From 65438 to 0845, hershey, an Englishman, found that injecting transparent animal glue between glass and eyes and placing it on the surface of cornea could temporarily correct the vision of patients.
1938, due to the invention of plastic PMMA, Mullen and O Brin made the first pair of all-plastic contact lenses made of PMMA.
1960, Otto Tarla, a scientist from Czechoslovakia, developed a HEMMA material which softened after absorbing water and was suitable for human use, and made the first pair of soft contact lenses.
197 1 year, Bosch & Lomb was approved by FDA for the first time to produce and sell soft contact lenses in the United States.
1974, in order to improve the oxygen permeability of lenses and make them safe to wear overnight, a breathable hard lens material (silicone acrylate, SMA) was born. Due to the intervention of silicon component, the oxygen permeability of the lens is further improved, and on this basis, a variety of breathable hard lens materials are derived, and the representative one is fluorosilicone acrylate (FSA). The organic fluorine component makes the material have better oxygen permeability.
Nowadays, contact lenses are generally made of polymer materials.
The latest research results released by researchers at the Southwest Medical Center of the University of Texas in the United States show that they can make contact lenses by using a new silicone hydrogel material to reduce the chance of bacterial infection in the eyes. This is a major breakthrough in the development of contact lenses, and the US Food and Drug Administration has approved the application of this new material in the production of contact lenses for throwing the moon.
Nowadays, contact lens technology is becoming more and more mature and has become a popular commodity.