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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.
Usage
Monthly Disposable Extended Wear 30 Days "With PureVision2 HD for Presbyopia 3 Pack monthly disposable lenses, you have the options of wearing them as daily wear lenses, as well as continuous wear for up to 30 days without removing them at night. The lenses are still to be properly cleaned and stored overnight after each daily or a series of continuous wear, and scheduled to be replaced with a new pair after 30 days. Not everyone can wear contact lenses overnight, please consult your optometrist whether PureVision2 HD for Presbyopia 3 Pack is suitable for you."
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