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(488-514 nm), Tuneable Dye laser (577 nm), HeNe laser (633 nm), Ruby laser (694 nm), GaAIAs Diode (600 – 1000 nm), NdYag (1060 nm) and Carbon Dioxide laser (10 600 nm) are examples of lasers of differing sources and wavelengths (Bradley, 2002). 3.2.1.2 Present Laser Usage Lasers are widely used in industry for cutting and boring metals and other materials, communications, scientific research and holography. They are an integral part of every day life with familiar devices such as bar-code scanners, scanners, laser printers, and compact disk players. Of particular interest is their medicinal use. Laser Therapy is an example of modern use of light therapy. Of interest is the high intensity laser used to perform surgical procedures and the low intensity lasers that are used, not as a cutting instrument, but rather for their healing effects (Lucent, 2000). 3.2.1.2.1 Surgical Lasers Kumar Patel of Bells-labs in 1964 invented the carbon dioxide laser, which permitted surgeons to perform highly intricate surgery using photons, rather than scalpels, to both operate on and cauterise wounds. Lasers today can be inserted in the human body, performing operations that would be impossible without them, at little risk or discomfort to the patient. Shorter (green) lasers are used to repair detached retinas, change the corneal curvature (LASIK), or to burn away lens membrane discolouration following cataract surgery (Lucent, 2000). 3.2.1.2.2 Low Intensity Laser Therapy Low intensity laser therapy first appeared more than 30 years ago. Since then approximately 2000 studies have been published on this topic. Medical treatment with coherent light sources (lasers) or noncoherent light (Light Emitting Diodes, LED's) have greatly advanced today’s health care with numerous disciplines making use of laser healing properties. Laser therapy is being used by physiotherapists to treat various acute and chronic musculoskeletal aches and pains. Dentists use it to treat inflamed oral tissues and to heal ulcerations. Dermatologists have used lasers to treat oedema, chronic ulcers, burns and skin ailments. Rheumatologists use it for pain relief, treatment of chronic inflammations and autoimmune diseases, and other specialists utilize this therapy for treatment of middle and inner ear diseases, and nerve regeneration. Laser 33PDF Image | THE USE OF LIGHT AND COLOUR AS A HEALING MODALITY
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