If you want to wear contact lenses overnight, so be sure to choose the oxygen permeability of silicone hydrogel material in more than 125 contact lenses, the lens of the hydrogel material is definitely not overnight.
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Each part of the body to "breathe", that is oxygen metabolism, the eye is no exception. Wear contact lenses when the eyes open during the day, little respiratory effects on the eyes, but sleep at night when wearing contact lenses, will form larger disorder of the eye oxygen metabolism, so that occurred "suffocation"to eyes. In the past though there have been many wearers try wearing ordinary contact lenses overnight, but most due to lack of oxygen caused eye irritation. Seems that the oxygen permeability of contact lenses is the key to its ability to wearing overnight. It was only after a lot of research, in 1998, and finally confirmed when wearing glasses sleep, the oxygen permeability of the lens 125 to meet the eyes oxygen minimum requirements. Finally recognized after years of argument scientists: as long as the oxygen wearing contact lenses sleep, the eyes must be better than not wearing contact lenses sleep less, so the stronger the oxygen permeability of contact lenses, the smaller endanger sleep on the glass.
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With the replacement of contact lenses, contact lenses come out claiming you can wear overnight, and contact lens wearers should pay special attention to the ordinary contact lenses are often close to the "ultra-thin gas permeable" or "high water and high oxygen" permeability commercial packaging, the amount of oxygen up to only about 30, wearing glasses overnight the difference is very large of the eyes of oxygen required minimum standard, so do not wear overnight. " Fluorosilicone hydrogel "contact lenses make the oxygen permeability of the lenses have a more substantial increase, known as the "breathable soft lenses", but even this new material contact lens, wearers also need to identify prospective lens oxygen permeability (Dk / t) to be much higher than 125, in order to ensure that your eyes protect from injury during sleep.
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