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Topic: Photosensitivity

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	NSE : Information on epilepsy : Photosensitive epilepsy
		Photosensitivity is more common in children and young people and is less commonly diagnosed after the age of 20.
		A tonic clonic (convulsive) seizure is the most common type of seizure to be brought on by photosensitivity, although this may vary from person to person.
		Some people with photosensitive epilepsy also have seizures that are not triggered by flashing lights or geometric patterns, while other people may only have seizures due to this trigger.
	www.epilepsynse.org.uk /pages/info/leaflets/photo.cfm (959 words)

	Photosensitivity -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-11)
		Photosensitivity is the amount to which an object (additional info and facts about react) reacts upon receiving (A quantum of electromagnetic radiation; an elementary particle that is its own antiparticle) photons of ((physics) electromagnetic radiation that can produce a visual sensation) light.
		Devices that are photosensitive include the human (The light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve) retina and (Photographic material consisting of a base of celluloid covered with a photographic emulsion; used to make negatives or transparencies) photographic film.
		Film is photosensitive because it has a (Produced by or used in a reaction involving changes in atoms or molecules) chemical reaction when struck by light.
	www.absoluteastronomy.com /encyclopedia/p/ph/photosensitivity.htm (179 words)

	Encyclopedia: Photosensitivity (Site not responding. Last check: 2007-10-11)
		Photosensitivity is the amount to which an object reacts upon receiving photons of light.
		Film is photosensitive because it has a chemical reaction when struck by light.
		Typical substances that are photosensitive are alkali salts, such as silver halide.
	www.nationmaster.com /encyclopedia/Photosensitivity (599 words)

	Gale Encyclopedia of Medicine: Photosensitivity
		Photosensitivity is any increase in the reactivity of the skin to sunlight.
		The term photosensitivity refers to any increase beyond what is considered normal variation.
		Phototoxicity is a severely exaggerated reaction to sunlight caused by a new chemical in the skin.
	www.findarticles.com /p/articles/mi_g2601/is_0010/ai_2601001058 (577 words)

	Chemical Photosensitivity: Another Reason to Be Careful in the Sun
		Also, although research has shown that the numbers of photosensitized individuals may be high, most people do not associate the sun's light with the development of their skin eruptions.
		Although literally, photophobia is fear of light, photophobic photosensitivity disorder patients avoid light not because they're afraid of it but because their eyes are painfully sensitive to it.
		In such cross-reaction, photosensitivity to one chemical increases a person's tendency for photosensitivity to a second.
	www.fda.gov /fdac/features/496_sun.html (1645 words)

	Photosensitivity Reactions: Sunlight and Skin Damage: Merck Manual Home Edition
		Photosensitivity, sometimes referred to as a sun allergy, is an immune system reaction that is triggered by sunlight.
		Photosensitivity reactions include solar urticaria, chemical photosensitization, and polymorphous light eruption and are usually characterized by an itchy eruption on patches of sun-exposed skin.
		Chemical photosensitivity is a condition in which people develop redness, inflammation, and sometimes brown or blue discoloration in areas of skin that have been exposed to sunlight for a brief period.
	www.merck.com /mmhe/au/print/sec18/ch214/ch214c.html (564 words)

	Photosensitivity (sun allergy). DermNet NZ
		Photosensitivity is caused by the introduction of an external agent that is applied topically or administered internally.
		Photosensitivity is caused by a pre-existing genetic disorder, e.g.:
		Photosensitivity can be confirmed by phototests – artificial light from various different sources is shone on small areas of the skin to see whether the rash can be reproduced, or if sunburn occurs more easily than expected.
	dermnetnz.org /reactions/photosensitivity.html (835 words)

	ThirdAge: Photosensitivity
		The most important step toward treating photosensitivity is to identify whether an external substance is causing the reaction, and then eliminate it if possible.
		Beta-carotene, a plant pigment giving color to carrots and yams, may be beneficial for at least two kinds of photosensitivity: polymorphous light eruptions 6,7 and photosensitivity caused by certain types of porphyria.
		Photosensitivity can also result from touching or eating other plants, including celery, dill, fennel, fig, lime, parsley, and parsnip, as well as arnica, artichoke, chrysanthemum, dandelion, lettuce, endive, marigold, and sunflower.
	www.thirdage.com /healthgate/files/21637.html (1879 words)

	LUPUS FOUNDATION OF AMERICA
		Abnormal light sensitivity, or "photosensitivity," is a major feature of both systemic lupus erythematosus (SLE), which can affect any organ or system of the body, and cutaneous lupus, which is mainly limited to the skin.
		The American College of Rheumatology loosely defines photosensitivity as "a skin rash as a result of unusual reaction to sunlight." Using this definition, photosensitivity has been identified in one-half to three-fourths of people with systemic lupus.
		In people with cutaneous lupus, photosensitivity affects 50 percent of those with discoid lupus and 70-90 percent of those with subacute cutaneous lupus.
	www.lupus.org /education/brochures/photosensitivity.html (365 words)

	Photosensitivity
		Rarely, a metabolic disorder called porphyria may present to the doctor as symptoms of photosensitivity, as can another rare condition, the autoimmune disease (self-allergy) lupus erythematosus.
		Photosensitivity thought to be induced by contact with certain items can be tested by Photopatch tests.
		Adhesive patches containing known photosensitising materials are applied to the upper back, removed after two days, and light is shone on the area, which is then reviewed two days later to judge the response.
	www.netdoctor.co.uk /ate/asthmaandallergy/203441.html (718 words)

	Photosensitivity definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms
		Photosensitivity: In medicine, increased sensitivity of the skin to light and other sources of UV.
		Photosensitivity commonly causes reddening and blistering of the skin with exposure to sunlight and, in time, it heightens the risk of skin cancer.
		The eyes may also be oversensitive to light, a condition called photophobia, as occurs for example in measles.
	www.medterms.com /script/main/art.asp?articlekey=4883 (226 words)

	Photosensitivity and color fastness : BR-111™ Exotic Hardwood Flooring
		Photosensitivity and color fastness : BR-111™ Exotic Hardwood Flooring
		Photosensitive species will darken with exposure to light, enhancing the natural beauty of the exotic species.
		As your exotic hardwood flooring matures, the species will develop an enhanced and rich depth of color that is superior to the initial out of the box installation.
	www.br111.com /photosensitivity1.html (53 words)

	Children Of The Moon A Family Friendly Virtual Community For Persons With XP And Other Photosensitivity Disorders
		Children Of The Moon A Family Friendly Virtual Community For Persons With XP And Other Photosensitivity Disorders
		The sun gives us light, but the moon provides inspiration.
		If you look at the sun without shielding your eyes,
	www.moonchildren.com (37 words)

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