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...gion of the [[electromagnetic spectrum]] that lies just beyond the visible light range, with wavelengths ranging from about 700 nanometers (nm) to about 250 ...ile "infrared" refers to a type of light that is below the red part of the visible spectrum.

== Optical Imaging == '''Optical imaging''' (pronunciation: /ˈɒptɪkəl ˈɪmɪdʒɪŋ/) is a technique used to vi

...ften refers to the application of various forms of radiation in diagnostic imaging and treatment. The term is derived from the Latin word 'radius', meaning 'b ...diation, similar to light but with higher energy. They are used in medical imaging to visualize the internal structures of the body, particularly bones.

...dicine) is a branch of medicine that involves the study and application of light with respect to health and disease. The term "Photomedicine" is derived from the Greek words "photos" meaning light and "medicine" from the Latin "mederi" meaning to heal or cure.

...''' (pronunciation: bio-fo-ton-ics) is a multidisciplinary field that uses light-based technologies to study biological materials. ..."Photonics" is derived from "photon", the fundamental particle of visible light.

...ning "below", and ''red'', the color of the longest wavelengths of visible light. ...ght. He named it "infrared" because it lies just beyond the red end of the visible spectrum.

...' (pronunciation: /ˈɒptɪkəl/) is an adjective that pertains to or involves light or vision. It is derived from the Greek word "optikos," which means "of sig ...optical can refer to various tools and procedures that involve the use of light, such as optical coherence tomography or optical microscopy.

...ron), meaning "nerve", and "photonics" from the Greek φῶς (phôs), meaning "light". Neurophotonics is a rapidly evolving field that uses light-based technologies to explore the mysteries of the brain and nervous system

...ures to facilitate inspection by making certain structures, such as veins, visible. ...m the Latin words "trans", meaning "across", and "illuminare", meaning "to light up".

'''Night vision''' (/naɪt ˈvɪʒən/) is the ability to see in low-light conditions. Whether by biological or technological means, night vision is m ...rm "night vision" comes from the ability to see during the nighttime, when light is scarce. The term is derived from the Old English 'niht' (night) and the

...ˌfoʊtoʊflʊərɒɡrəfi/), also known as '''fluoroscopy''' is a type of medical imaging that shows a continuous X-ray image on a monitor, much like an X-ray movie. The term photofluorography is derived from the Greek words ''phos'' (light), ''fluoros'' (flowing), and ''graphein'' (to write).

..., or Raman scattering, of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range. ...rgy (color) before and after being scattered. However, a small fraction of light (approximately 1 in 10 million photons) is scattered inelastically. In this

...es active and can make the cancer cells more visible. Gleolan is a type of imaging agent and a type of photosensitizer {{dictionary-stub}} [[Category:Dictiona

* [[Orthogonal view]]: In medical imaging, this refers to a view that is taken at a right angle to the standard view. ...zation]]: This is a term used in microscopy to describe the orientation of light waves in relation to each other.

...aves]], [[Microwave|microwaves]], [[Infrared|infrared radiation]], visible light, [[Ultraviolet|ultraviolet radiation]], [[X-ray|x-rays]], and [[Gamma ray|g ...forecasting, and many other areas. For example, x-rays are used in medical imaging to view the inside of the human body, while microwaves are used in cooking

...electromagnetic radiation. The term "laser" originated as an acronym for "Light Amplification by Stimulated Emission of Radiation". * [[Electromagnetic Radiation]]: A kind of radiation including visible light, radio waves, gamma rays, and X-rays.

...throat formed by the angle of the thyroid cartilage surrounding the larynx visible especially in males. * [[Anal verge]] - The area of the anal canal that is directly visible from the exterior of the body.

...is a product of the entrance of the optic nerve into the eyeball, where no light receptors are present on the retina * [[Edema]] - abnormal buildup of fluid in the body, which may cause visible swelling