Lasers have opened up a branch of healthcare, enabling new ways of treating disease or any other type of medical procedure. With laser innovation, optometrists can adjust the focus of the cornea, allowing for better, clearer vision. Commonly known as laser eye surgery, this procedure, or rather various types of procedures, uses a special laser called an "excimer" to correct any refractive error in the eye (laser eye surgery). Laser innovation has also opened up an option for those who wish to remove their unwanted tattoos. Before the introduction of laser hair removal, tattoos were a permanent form of bodily altercation. With the laser, doctors can create a safe beam of light that breaks paint into tiny fragments, allowing the immune system to safely remove it (Tattoo Removal 5). Lasers have also changed the life of the average citizen by opening up a way to communicate information. For example, barcodes have become a way to easily manage inventory and pricing of an item. Although it is more expensive than traditional barcode readers, the laser reader uses the capabilities of the laser efficiently (Bar Code Scanner). It uses the enhanced light capacity of the laser to reach great distances (Barcode Scanner). With this capability, it can also scan uneven surfaces, making it more efficient than the conventional scanner (Bar Code Scanner). Additionally, devices such as CD or DVD players came into existence because scientists found a way to encrypt the information on reflective discs. In addition, lasers have changed industrial life. They could be used to easily cut tough materials, such as steel and diamonds. Both processes use the input data to calculate the most efficient way to cut the material (laser cutting). Welding has also become another possibility because the heat produced by the laser melts the two parts.