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Type III (aka hepatic photosensitivity) is the most common type of photosensitivity reaction seen in animals. [2] In this type, the photodynamic substance is phylloerythrin, a derivative of chlorophyll produced in the body. Normally, phylloerythrin is secreted into the intestine by the biliary system and excreted through the feces.
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.
Photosensitivity is the amount to which an object reacts upon receiving photons, especially visible light. In medicine, the term is principally used for abnormal reactions of the skin, and two types are distinguished, photoallergy and phototoxicity .
Porphyrins, a class of natural molecules occurring in the body and accumulating in patients with certain genetic disorders in the building chain of the red blood dye heme: porphyria; Phototoxicity is a quantum chemical phenomenon. Phototoxins are molecules with a conjugated system, often an aromatic system.
Phototoxins are toxins that can cause allergic reactions in particularly susceptible individuals and which can cause dangerous photosensitivity in a much broader range of subjects. Phototoxins are common in: a variety of plants (including food plants where they may be a biological defence): many citruses contain essential oils that are ...
Photophobia is a medical symptom of abnormal intolerance to visual perception of light. [1] As a medical symptom, photophobia is not a morbid fear or phobia, but an experience of discomfort or pain to the eyes due to light exposure or by presence of actual physical sensitivity of the eyes, [2] though the term is sometimes additionally applied to abnormal or irrational fear of light, such as ...
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Photosensitivity is also found in some of the porphyrias. Nearly all cases of porphyria cutanea tarda [ 18 ] exhibit blister formation on the skin within 2–4 days of light exposure. Variegate porphyria [ 19 ] and hereditary coproporphyria [ 20 ] can also exhibit symptoms of light-induced blisters.