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The word laser stands for “Light Amplification by Stimulated Emission ofRadiation.” A laser is a concentrated beam of light, created when an electric current passes through a special material. The name and the color of the laser depend on the type of special material that is used. The YAG (yttrium-aluminum-garnet) is an invisible infrared light laser or is also known as a photodisruptive laser. The light cuts or sculpts the tissue, similar to a knife, so the beam of light is used to cut thin membranes inside the eye that are blocking vision such as is seen in secondary cataracts.