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- Oxygen permeability expresses the ability of the lens to let oxygen reach the eye by diffusion. It is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.
- A higher Dk value means higher level of oxygen can pass through the lens and reach the eye.
Description
The Bausch + Lomb PureVision®2 For Presbyopia (balafilcon A) Visibility Tinted Contact Lens is a soft hydrophilic contact lens that is a front surface asphere consisting of multiple aspheric zones with a spherical base curve. The most plus power is in the center of the lens progressing to more minus in the periphery. The lens material balafilcon A is a copolymer of a silicone vinyl carbamate N-vinylpyrrolidone a siloxane crosslinker and a vinyl alanine wetting monomer and is 36% water by weight when immersed in a sterile borate buffered saline solution. This lens is tinted blue with up to 300 ppm of Reactive Blue Dye 246.
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