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Light therapy and Laser therapy are described non-coherent and coherent respectively (Rose, 2017). Non-coherent light describes the photons in the wavelength, being non-coherent means that the photons are at different frequencies and oscillate in different directions. Light therapy is a form of non-coherent light. Coherent light means that the photons in the wavelength are at the same frequency and are all at the same direction, therefore producing a beam of light which is seen as laser. Laser light will not diffuse out and therefore stays in the beam unlike coherent light, meaning that coherent light can be more harmful to the therapist administering the laser. The body has the ability to adapt this incoherent light to coherent in the body and studies have shown that the body can produce coherent light from non-coherent light when used over certain and specific areas, usually acu- points (Rose, 2017). This also gives light therapy an advantage over laser as the light is the same when applied over these points, giving the device an extra use. Using this on acupressure points when used in therapy sessions may also have a therapeutic effect. 2.3 Thermal Imaging Another form of assessment is generally used in therapy sessions and veternairy medicine to assess heat spots within an animals body is Thermal Imaging. Thermal imaging is a non-invasive technique, for the horse and operator but also in the sense that it does not give out any radiation that potentially could damage the skin (Redaelli et al., 2014). The thermal imaging camera enables the operator to see different electromagnetic waves that cannot be seen with a human eye. The electromagnetic waves change colour in accordance to how much radiation is emitted, the hotter an object the more radiation is emitted (Redaelli et al., 2014). Red and white colours are the hotter temperatures and the blue colours represent the colder temperatures, however most cameras are equipped with a key on the side of the screen allowing the colours to accurately represent what radiation is being emitted, making it easier for the operator to understand what the image is representing. Cameras can have different colour settings which can make it difficult for the operator to distinguish between the colours as to what they mean. The camera in this study, the flir C3 has two colour settings. 8PDF Image | THE EFFECT OF LIGHT THERAPY ON HEART RATE, HORSES
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