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Light sensitivity or photosensitivity refers to a notable or increased reactivity to light. Apart from vision, human beings have many physiological and psychological responses to light. In rare individuals an atypical response may result in serious discomfort, disease, or injury. Some drugs have a photosensitizing effect. Properties of natural or artificial light that may abnormally affect people include: Conditions that may include sensitivity to light include vertigo and chronic fatigue syndrome.

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  • Photosensitivity in humans
  • Fotosensibilidad
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  • Light sensitivity or photosensitivity refers to a notable or increased reactivity to light. Apart from vision, human beings have many physiological and psychological responses to light. In rare individuals an atypical response may result in serious discomfort, disease, or injury. Some drugs have a photosensitizing effect. Properties of natural or artificial light that may abnormally affect people include: Conditions that may include sensitivity to light include vertigo and chronic fatigue syndrome.
  • La fotosensibilidad es una respuesta exagerada a la luz, generalmente luz solar, que se manifiesta minutos, horas o días después de la exposición y puede persistir durante un tiempo variable. La reacción aparece solo en las regiones expuestas a la luz. Se produce por sustancias que, previamente, han de haber sufrido fotoactivación, por absorción de la energía fotónica. Las reacciones de fotosensibilidad pueden ser causadas por agentes endógenos o exógenos: Las reacciones de fotosensibilidad pueden ser fototóxicas o fotoalérgicas.
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  • Light sensitivity or photosensitivity refers to a notable or increased reactivity to light. Apart from vision, human beings have many physiological and psychological responses to light. In rare individuals an atypical response may result in serious discomfort, disease, or injury. Some drugs have a photosensitizing effect. Properties of natural or artificial light that may abnormally affect people include: * Timing of light (upset of normal circadian rhythms, seasonal affective disorder, sleep disorders) * Intensity of light (photophobia, sunburn, skin cancer) * Wavelength of light (in lupus, urticaria) * Rapid flickers in intensity of light may trigger or aggravate photosensitive epilepsy, epileptic seizure, or migraine headaches. Conditions that may include sensitivity to light include vertigo and chronic fatigue syndrome. Controlled application of artificial light can be used in a program of light therapy to treat some disorders.
  • La fotosensibilidad es una respuesta exagerada a la luz, generalmente luz solar, que se manifiesta minutos, horas o días después de la exposición y puede persistir durante un tiempo variable. La reacción aparece solo en las regiones expuestas a la luz. Se produce por sustancias que, previamente, han de haber sufrido fotoactivación, por absorción de la energía fotónica. Las reacciones de fotosensibilidad pueden ser causadas por agentes endógenos o exógenos: * Agentes endógenos: moléculas del organismo, habituales en la piel, o bien que se acumulen en ella como consecuencia de una alteración metabólica, como ocurre en el caso de las porfirias, trastornos que cursan con un acúmulo de porfirinas, agentes endógenos fototóxicos. * Agentes exógenos: medicamentos y otros productos químicos. Pueden acceder a la piel por vía tópica o sistémica. Las reacciones de fotosensibilidad pueden ser fototóxicas o fotoalérgicas.
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