Lasers are an important advance in medicine and surgery.
Otolaryngology-head and neck surgeons use lasers to improve the care of patients in many ways. Doctors make use of the laser's properties for this sinus surgery. Through a complicated electronic process, a beam of light is produced which has special properties. The light is focused so that all of its rays are traveling in the same direction. In a similar fashion, you might use the lens of a magnifying glass to focus rays of sunlight to a point.