1.   They use ink as opposed to the plastic toner used by lasers.

2.   Developed by NASA and two private companies, the laser uses the same hardware to produce two wavelengths of light.

3.   Summit is in the fiercely competitive business of making excimer lasers used to correct nearsightedness, which affects about one in four Americans.

4.   Visx makes excimer lasers used by eye doctors to treat nearsightedness by removing layers from the cornea.

5.   The laser uses a cold beam of ultraviolet light to vaporize cells in the cornea, the clear covering of the eye.