Problem description:
Hurry up, I need it urgently.
Analysis:
The history of contact lenses can be traced back to nearly 500 years ago.
/kloc-one day in 0/508, Leonardo da Vinci put his head into a hemispherical glass jar filled with water and looked out. He found that because of the refraction of light, the invisible objects became clear. It was such an accident that opened the history of contact lenses-Leonardo da Vinci became the founder of contact lens theory.
After 380 years, this theory began to be practical. During the period of 1888, Fick, a German, and Carter, a French, experimented at the same time, and made the glass lens into an angled lens larger than the cornea to correct vision.
After the initial attempt, "the emergence of transparent polymethyl methacrylate (PMMA) triggered a revolution in contact lenses". 1938, Moran and Aubrey developed the first pair of corneoscleral contact lenses with PMMA, which has been used as the main material of hard contact lenses until today.
However, contact lenses were really born after 10 years, and they were popularized in clinic to correct ametropia of patients' eyes. 1948, Kevin Toch, an American optometrist, pioneered a small lens called microlens, which is smaller and thinner than the cornea and can be worn comfortably all day. Since then, the pattern design of hard contact lenses has been improved several times.
1960, the efforts of Czech scientist Wichita Lei and ophthalmologist Zhuang Fusi opened the era of soft contact lenses and breathable hard contact lenses. They developed a kind of soft contact lens with hydrophilic resin, which is softer in material, less foreign body sensation, better in wettability and has certain air permeability compared with ordinary hard lenses.
It was not until 1960 that Wichita Ray and ophthalmologist Zhuang Fusi developed soft contact lenses with hydrophilic resin that Dr. Bosch & Lomb really became attached to contact lenses-the company not only obtained the right to produce and sell this kind of contact lenses, but also became the first company to be certified and approved by the US FDA in the research of 1 1 year.