Friends will always be heard complaining about wearing contact lenses all the inconveniences and the face of all these various types of contact lenses at a loss when the selection. With the quality of life and enhance the needs of a variety of social occasions, as well as the aesthetic requirements of Convenience, contact lenses have been gradually become a major public awareness Purchase Products. However, when purchasing, do you really know the contact lenses, whether the election to be able to fit your product, may be contact lenses is growing consumer base required to seriously consider the question.
Contact lenses since the 16th century, invented by Leonardo da Vinci has been gone through 400 years of development history, from the initial request of Convenience, simplicity; to subsequent hygiene, comfort; to later fashion, beauty. Contact lenses are no longer alone as the only framework in certain situations, an alternative to glasses, but is, vision correction, a new type of Cosmetology Fashion Products.
Advent of the earliest contact lenses because of the inconvenience of spectacles, we engaged in sports or take part in some social occasions, the heavy frame glasses for our inconvenience. However, the early contact lenses are at last resort wear temporary substitutes. Technology makes content less time to wear contact lenses in just a few hours later there will be a variety of eye discomfort, such as adverse reactions.
Later, people discovered the unique characteristics of contact lenses: Convenience. And is committed to the development of more comfortable and longer wearing product. This period, the hygiene standards of comfort has become a buy and set off a wave of wearing contact lenses.
Subsequently, the contact lens business is aware of the tremendous market potential and the development of its other features: beautiful. The birth of a variety of color lenses make Shincho young family to become its fans.
In fact, in a fast-changing and stress doubled the modern society, the health of people give a higher demand. Contact lenses on corneal damage gradually surfaced and become increasingly concerned about the wear issue. NOT U.S. corneal blood vessels, is therefore necessary to absorb oxygen in the air to maintain the cells in physiological activity. Direct contact with corneal contact lenses need to have good oxygen permeability function. Discovery of this issue to the contact lens manufacturers leave behind a technical problem.
Available material commonly used in contact lenses are hydrogel, that is, with water as the dispersion medium of the gel. Is a polymer network system, the nature of soft, can maintain a certain shape, can absorb large quantities of water. This material may depend on its own characteristics, to the cornea to add moisture and oxygen dissolved in water. Moisture so slowly become the standard U.S. one of the criteria to buy glasses.
However, the higher the water content is not better, because the water completely to rely on a channel, then a longer time, the lens itself will be contained in the water evaporation, the lens will be super absorbent can absorb water in the tear, which also is caused by dry eyes are an important cause.
Also appeared in the market with advanced technology, new contact lenses are silicone hydrogel material.
Hydrogel at the basis of an increase of silicon, fluoride and other chemical elements to the ability of oxygen permeability to a qualitative change. First of all, a special element to allow oxygen into and out more smoothly, and secondly, the special structure of the mesh material to form oxygen and water, dual-channel, so that the cornea of oxygen directly. In addition, the silicone hydrogel material has been found that silicone hydrogel contact lens materials, not only corrected visual acuity, and wear comfortable, convenient and at the same time induced a lower risk of eye diseases. Contact lenses are the first choice for health.
Know the type of contact lens material, in similar products, we have the criteria used to evaluate their advantages and disadvantages of this? In front of us talked about the water content, in fact, measure the water content of glasses are an indirect oxygen standard conditions.
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