knockoff oakleys How to choose the center thickness of contact lenses

How to choose the center thickness of contact lenses
Several small can tell you on the purchase of contact lens parameters: The main water content, oxygen permeability and diameter, and today we talk about contact lenses give another important parameter: center thickness. I hope to help a friend buy contact lenses.
Center thickness of contact lenses, fake oakleys for sale  even the same model, will also vary with changes in the degree of change, and the center thickness of the vendors listed, usually with an example of when the 300 degrees of myopia.
When the center thickness of less than 0.05 mm, can be called thin, central thickness of 0.07 mm, can be referred to as standard, and larger than 0.07 mm, there is no common call.
Generally, indeed thinner center thickness, the more comfortable to wear, but in fact the center will not be much difference between the thickness of 0.10 mm or less, and comfort, it is such a center thickness of 0.035 mm and 0.084 mm compared , knockoff oakleys  comfort is not wearing them will be very different. But when the center thickness greater than 0.10 mm, although we can not say definitely when wearing uncomfortable, but the chance of discomfort that will inevitably increase the.
Lens center thickness thicker lenses will reduce the amount of oxygen, whereas thinner lenses, the higher oxygen content.
Below Johnson same two materials of different thicknesses product examples.
Johnson Shu Xi monthly disposable (throw abroad called two weeks, TC called monthly disposable).
Johnson Run eye two weeks to throw (the country has been delisted, but the United States and in some countries as well as selling, cheap fake oakleys  pay attention to the "Run eye" and not a product, and Johnson another "bright eye confusion").
Both materials are Etafilcon A, the oxygen permeability of the material itself is 28 Dk. Both are also 14 mm in diameter.
Johnson Shu Xi center thickness is 0.07 mm, the amount of oxygen is 30 Dk / t.
Johnson Run eye center thickness is 0.084 mm, replica oakleys  the amount of oxygen is 26 Dk / t.
The above example shows that Johnson Run eye center thickness slightly larger than Johnson Shu Xi, so have a little amount of oxygen decreased.
Thus, the amount of oxygen in addition to the material itself affects income, but also by the impact made invisible after the center thickness of the thinner lenses, higher oxygen content, whereas the thicker the lens, the lower the amount of oxygen.
Also, part of the astigmatism contact lenses can be positioned in order to achieve reduction in the eye rotation, it will inevitably have to do a little thick lenses, so invisible, a little thicker than normal myopic astigmatism of the same model, foakleys sunglasses and certainly not All models are, some use other technologies are able to do without increasing the thickness of the lens.