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Authority to a third party inspection agencies inspection 6 cast brand, contact lenses, assessment report: haichang, fizz, oxygen transmission performance is poor, for a long time to wear is easy to cause corneal edema
"To get oxygen from environment cornea, wearing contact lenses will to a certain extent, affect the oxygen supply, if the contact lens oxygen transmission performance is not ideal, Knockoff Ray Bans wearing a long time, corneal edema, which may cause hypoxia related complications."
A pair of bright big eyes everyone is eager to have.With the popularity of contact lens, took off her glasses a lot of beautiful people.The boost spending power and more attention to eye health, more and more consumers choose the short cycle threw the, month, day type of contact lenses.
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In November 2014, "consumer reports" authority to a third party inspection agencies inspection the bausch, Johnson &johnson, alcon, hydron, weicon, fizz kang and so on six big brand, contact lenses, through the oxygen index and optical index test product comparison.
Your daily breathing really?Our test results show that all products are measured through oxygen coefficient, oxygen permeability is lower than the nominal,Cheap Knockoff Ray Bans fizz kang and haichang performance was a "surprise".And haichang EASYDAY Gao Qingshui embellish, oxygen permeability is 29.56% lower than the nominal value, is not in conformity with the national standard.
Oxygen permeability difference between the nominal value and the measured values
"Contact lenses can breath", "a 88% increase in oxygen flow", promote the enterprise seems to suggest that contact lenses products with superior performance of the air.
"To get oxygen from environment cornea,Cheap Fake Ray Bans wearing contact lenses will to a certain extent, affect the oxygen supply, if the contact lens oxygen transmission performance is not ideal, wearing a long time, corneal edema, which may cause hypoxia related complications."Ophthalmic center, sun yat-sen university, director of the center for contact lenses Yang Xiao to "consumer reports" the reporter said.
Based on a large number of contact lens wear clinical observation, in 1984, the modern clinical research and vision care optometry research pioneer Brien Holden and George William also namely formulate a set of standards to avoid oxygen to the cornea: wear contact lenses 1 day without corneal edema, oxygen permeability (Dk/t value) should not be less than 24 x 10 to 9.