How to select contact lenses？
Nowadays, more and more people are turning to the contact lenses due to different reasons. Currently, on the market there are many brands of the contact lenses. Theses kinds can be divided into various brands and different types according to the different performances. Since each kind of lenses has different characteristic, the diversification of species and functions brings difficulties to the consumers when choosing the contact lenses. Then which kind of the contact lenses is better?
First of all, when choosing the lenses, we must pay attention to that if the brand has the registration card of the National Food and the Drug Administration. The State Food and the Drug Administration adopt the ISO international standard to carry out the various functions of the lenses. For example the test of the damage to the cornea of the lenses, the test of the grinding process of the lenses, the use of the materials, the test of the water content of the lenses and the permeability, etc. Therefore, general speaking, the quality of the brand is guaranteed.
Secondly, the degree of the lenses, the size, the materials and the using time should also be taken into consideration when choosing the contact lenses. Many people think that the degree of the spectacles and that of the contact lenses are exactly the same. So they often purchase the contact lenses according to the degree of the spectacles. In fact, it’s wrong to do so. As to the same eye, the degree of the contact lenses and that of the spectacles are different. The higher are the degrees, the more obvious is the difference.
And then the size of the contact lenses should be determined according to the size of the black eyeball. If the people’s black eyeballs are big, they should choose the lenses of relatively big size. On the contrary, those whose black eyeballs are small; they’d better turn to those smaller lenses.
Well, there are still a lot of things you need to pay attention to when choosing the contact lenses. Remember that, the contact lenses are different from the eyeglasses with frames and they need more special attention
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