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Alcon's (ALC) new preservative-free solution for patients with dry eye symptoms is the latest addition to its leading global artificial tear brand Systane.
The contacts are placed into a special container with a platinum-coated disk, which reacts with the hydrogen peroxide. This “redox” reaction (reduction and oxidation) produces small bubbles that help to clean the contacts. After 6-8 hours, the hydrogen peroxide becomes an eye-safe saline solution. [4] At this point, it is safe to use the ...
“Contact lenses can warp over time, and your cornea can change shape,” Vadada said. “To make sure your lenses fit properly, and the prescription is right for you, see your eye doctor ...
The first contact lenses were made of glass, in 1888. Initially the glass was blown but soon lenses were made by being ground to shape. For the first fifty years, glass was the only material used. The lenses were thin, yet reports of injury were rare. In 1938 perspex (polymethylmethacrylate, or PMMA) began to replace glass in contact lens ...
Contact lens solutions often contain preservatives such as benzalkonium chloride and benzyl alcohol. Preservative-free products usually have shorter shelf lives , but are better suited for individuals with an allergy or sensitivity to a preservative.
Benzalkonium chloride, a preservative used in saline solution can increase tear break up speed, so it is important to choose preservative free saline solutions for moistening the flourescein strip. [6] Localised corneal surface abnormalities can produce dry spots in that location and can give a falsely low break-up time. [5]
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