21. The simplest is the excited electronic state; some of them find application in excimer lasers. 22. Phakic IOL appear to be less dangerous than excimer laser surgery in those with significant nearsightedness. 23. Besides, compared with commonly used mercury lamps, excimer lamps have a number of advantages. 24. Two excited helium atoms can also bond to each other in a form called an excimer . 25. There are many different types of lasers including gas, solid states lasers, and excimer . 26. Summit became the first company to receive formal notice of approvability from FDA for its excimer laser. 27. Visx makes excimer lasers used by eye doctors to treat nearsightedness by removing layers from the cornea. 28. He folds the flap back, then uses the excimer laser to reshape the corneal tissue beneath. 29. Microscopic layers of the exposed tissue are vaporized with an excimer laser to slightly reshape the cornea. 30. London has led the world in PRK research since studies began with the Excimer Laser in 1983.