Light is one of the oldest therapeutic agents.
Greek physicians frequently prescribed “heliotherapy.” The use of light continued unabated well into the 20th century, when it was largely supplanted by the advent of antibiotics and anti-inflammatory medication. Einstein first introduced the concept of a laser (Light Amplification by Stimulation Emission of Radiation) in 1916, but it was not until the 1960s that it came into medical use as a focused, high power beam with a photo-thermal effect–it vaporized tissue by intense heat. In 1967, however, a Hungarian
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