Are you looking for a brand of toric contact lenses for astigmatism that let you maximize the amount of time you can keep them in your eyes? Most extended wear brands allow up to seven days of continuous wear. But there is one brand, Purevision Toric contact lenses from Bausch and Lomb, that are approved by the US Food and Drug Administration for up to thirty days of continuous non-stop wear before needing replacement. That is an incredibly long period of time for contact lenses.
You may wonder how such a long amount of wearing time is possible. Bausch and Lomb uses careful engineering techniques to make sure the lenses are safe for use in this manner. They are constructed of a polymer called AerGel, which is designed to allow unusually large amounts of oxygen to pass through the lens and to the eye. Oxygen transfer is essential for having healthy eyes, so only a substance permitting the highest amounts of transfer possible could even be considered for extended wear of such length. Indeed, AerGel allows up to five times as much oxygen through the lenses as compared to other contact lens brands. It’s almost like wearing nothing.
But don’t the lenses get dirty if they stay in the eye for such a long time? Debris is indeed a challenge, but AerGel addresses that too. Purevision Toric lenses adds a surface method called Performa, which inserts ionized gas into the hydrogel to maximize its moisture-absorbing capability. The higher the amount of moisture, the better the lens can repel dirt and debris before they have a chance to stick to your eye contacts. As an added bonus, this Performa process also discourages the buildup of protein and lipids from your tears on the surface of the lens, which helps to keep the lenses feeling smooth and soft for the entire time you wear the lenses.
OK, so you can wear these lenses a very long time, but what about curing your blurry vision? Astigmatism is a condition where the eye is shaped more like an oval or egg rather than a perfect sphere. This distorts the passage of light rays into the retina, causing them instead to scatter around. When you wear lenses like Purevision Toric, they behave as a prism that sits atop the cornea and compensates for its odd shape, which restores perfect vision by re-focusing light rays on the retina where they belong.
Stability of the lens while place don the eye is also of utmost importance. In order for the lens to compensate for the astigmatism properly, it must remain firmly in position with the thicker part of the lens towards the bottom of the eye. Purevision Toric lenses uses a specially crafted shape with rounded edges that promotes the greatest possible amount of stability with minimum rotation on the eyeball. The rounded edges also let tears flow under the lenses, which also contributes to keeping them moist and clean.
Before using these lenses, be sure to ask your vision care provider about them. While it’s true that the lenses are generally approved for such long periods of use, your individual medical needs may preclude you from the same schedule, or may perhaps allow for a lesser period of extended wear. Don’t take your chances. Ask your eye doctor for his or her opinion as to the best wearing and replacement schedule for you.
By the way, you can use these lenses for daily wear and removal if you decide not to use them for extended wear. They feature such a good design for maximum wearing comfort that many people choose them over other brands even if they have no interest in wearing them continuously.
Whether you use Purevision Toric lenses for daily wear, for the maximum 30 days of extended wear, or anything in between, you will probably be happy with the way these lenses feel and the way they cure your astigmatism. Whether it’s the self-cleaning properties, the high oxygen permeability, the excellent wearing comfort, or the flexible wearing schedule, there is something in these lenses for everyone to like. Try them out and see for yourself why they are one of the most popular brands of toric contact lenses out there.
David Long is an expert on toric contact lenses. Check out his site to find money-saving coupons and the best deals on Purevision Toric and many other toric lenses.
