Anaesthetic with your lenses?

There have been some contact lenses I've tried out over the years that may have benefited from an inbuilt anaesthetic, but not many, in fairness. Using contact lenses to administer anaesthetic could be a reality, according to latest news from the US where researchers have developed a means to administer pain relief following photorefractive keratectomy (PRK): http://www.sciencedaily.com/releases/2012/01/120118112001.htm Researchers found that adding vitamin E to the lenses extended the time of release of three commonly used anesthetics from just under two hours to up to a day -- or a few days in some instances. The vitamin E is said to act as a barrier, keeping the anesthetics on the eye. As someone who would not go down the laser surgery route, even with the more common current procedures of Lasik or Lasek, regular contact lenses will continue to be my vision correction of choice.