The history of contact lenses has been one of continual improvement and Focus Night & Day contacts are one indication of that. The lenses are safe to wear continuously for up to 30 days, as certified by the FDA. And after weeks of wear, you don't have to clean Focus Night & Day contacts, because they're disposable.

In the early 1980's some contact lenses were being prescribed for 30 days of continuous wear. However, this was before it was known how important an adequate supply of oxygen is for maintaining the health of your cornea. But after the incidence of eye infections grew as a result of using these lenses, the problem became clear. And this was something that Focus Night & Day contacts had to solve.

Because there's no blood vessels in your cornea, it must rely on an external supply of oxygen to function. But early contact lenses weren't good at allowing enough oxygen to pass through to the cornea, especially when worn during sleep. But the materials used to make contact lenses have steadily improved and Focus Night & Day contacts allow up to six times as much oxygen to get to the cornea as other disposable lenses.

A problem that is common to all extended wear contact lenses is a buildup of the natural deposits from your eyes and the environment. They not only affect your visual clarity, but can also be a source for bacterial infection. To overcome this problem, Focus Night & Day contacts have a biocompatible surface coating.

Normally, your body has a biological defense reaction to any foreign object in your eye. So a normal contact lens tends to get covered with various substances from your tears. To counteract this defense mechanism, Focus Night & Day contacts use a biocompatible surface coating. The lens's surface imitates that of a cell and so the lens is treated as a part of your body.

Focus Night & Day contacts are made by CIBA Vision, which is a world leader in making contact lenses. And to ensure the safety of the lenses, they were given over 2,000 patient years of testing. The positive results of this extensive testing led the FDA to approve these contacts for up to 30 days of continuous wear. This made them the first lenses with this approval since the FDA had rescinded approval for all 30-day lenses back in the 80's.