The notion of putting a corrective lens on the eye to achieve better vision is certainly nothing new. In fact, Leonardo da Vinci has developed this brilliant idea about 450 years. (Although there are no lenses were manufactured at that time, detailed drawings and descriptions were made.) AE Fick, a scientist in Zurich, has made the first contact lens in 1887 but quickly found that the human eye did not wear glass of reality. It took a major innovation in the years 1940, to produce the ancestors of contact lenses that we bring today: plastics. These lenses are made from a material called PMMA, which, in fact, was so well tolerated by the human eye that is still used for contact lenses difficult for intraocular implants goal and for orthopaedic.
Soft contact lenses were not available in this country until 1972, when Bausch and Lomb first introduced to the U.S. market. The original soft contact lenses tend to be more comfortable than the hard lenses available at the time, but because they were limited to a few sizes, these objectives have not many people. The big difference between hard and soft contact lenses was that the new soft contact lenses allowed to move oxygen through them - not only around the goal, as for contacts difficult. As a result, for a goal much healthier environment, because it allowed the eye "breathe" with a goal in place. The lack of oxygen to the cornea can lead to a loss of vision of the cornea and swelling epithelial cell damage. Since 1972, contact lenses have changed and has improved considerably. Now, lenses are designed to correct almost any vision problem and are available in models for extended wear, cosmetic changes (such as eye color), and availability.
The contact lenses to come an impressive variety of materials, sizes, shapes, thicknesses and colors. In general, they are divided into two broad categories: hard and soft. Hard contacts have evolved significantly since their introduction in the 1940's. Initially, improving their design and improved manufacturing techniques, but at the end of 1970 was a major step forward: the development of contacts that lasts "breathe" as soft contact lenses. We call these lenses rigid gas permeable contacts or RGPs.
The RGP lenses are more flexible and adapt better than the first hard lenses, and they last longer (compared to "wear") and sometimes better vision than soft lenses. They are manufactured by computer control towers that can create any type of surface necessary to correct the vision of someone. For example, if you have a high degree of astigmatism, an RGP lens can be ground with a curvature to match perfectly your cornea - to provide a healthier, more comfortable fit and a vision that is generally higher than offered by your glasses.
Another significant advantage to RGP lenses is that they can provide indeed, a new cornea for people with a problem of the cornea that distorts vision. Because this goal maintained his form on the eye - as opposed to molding itself to the eye, how a flexible lens does - it masks an irregularity cornea, can correct the optical surface, and improves vision
Soft contact lenses were not available in this country until 1972, when Bausch and Lomb first introduced to the U.S. market. The original soft contact lenses tend to be more comfortable than the hard lenses available at the time, but because they were limited to a few sizes, these objectives have not many people. The big difference between hard and soft contact lenses was that the new soft contact lenses allowed to move oxygen through them - not only around the goal, as for contacts difficult. As a result, for a goal much healthier environment, because it allowed the eye "breathe" with a goal in place. The lack of oxygen to the cornea can lead to a loss of vision of the cornea and swelling epithelial cell damage. Since 1972, contact lenses have changed and has improved considerably. Now, lenses are designed to correct almost any vision problem and are available in models for extended wear, cosmetic changes (such as eye color), and availability.
The contact lenses to come an impressive variety of materials, sizes, shapes, thicknesses and colors. In general, they are divided into two broad categories: hard and soft. Hard contacts have evolved significantly since their introduction in the 1940's. Initially, improving their design and improved manufacturing techniques, but at the end of 1970 was a major step forward: the development of contacts that lasts "breathe" as soft contact lenses. We call these lenses rigid gas permeable contacts or RGPs.
The RGP lenses are more flexible and adapt better than the first hard lenses, and they last longer (compared to "wear") and sometimes better vision than soft lenses. They are manufactured by computer control towers that can create any type of surface necessary to correct the vision of someone. For example, if you have a high degree of astigmatism, an RGP lens can be ground with a curvature to match perfectly your cornea - to provide a healthier, more comfortable fit and a vision that is generally higher than offered by your glasses.
Another significant advantage to RGP lenses is that they can provide indeed, a new cornea for people with a problem of the cornea that distorts vision. Because this goal maintained his form on the eye - as opposed to molding itself to the eye, how a flexible lens does - it masks an irregularity cornea, can correct the optical surface, and improves vision
2 comments
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