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The word “laser” is the combination of the first letters of the statement “light amplification by stimulated emission of radiation” (Hecht, p:1). As an explanation of this statement, it can be said that laser is a device that creates and amplifies a narrow intense beam of consistent light. Laser light, has a specific wavelength and is focused in a narrow beam. This type of high-intensity light contains a lot of energy. Laser is an important technology because it has contributed to humanity as a powerful scientific tool for expanding human knowledge and in its many applications that help people directly. After the invention of laser, professors in many areas discovered different usages of laser, so it became a very common technology in many areas such as materials working, measurements and inspection, recording information, communications, remote sensing, etc. (Hecht, p: 11). The most important usage of laser technology is in surgery and medical treatment such as refractive surgery, cancer treatments and tooth surgeries. One of the important applications of laser in medicine area is refractive surgery, which improves vision by correcting refraction of light in the eye by means of surgical procedures. Refractive surgery is very widely used in the last years.
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