Wood's lamp

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Wood's lamp

Etymology: Robert W. Wood, American physicist, 1868-1955; AS, glaes
an illuminating device with a nickel oxide filter that holds back all light except for a few violet rays of the visible spectrum and ultraviolet wavelengths of about 365 nm. It is used extensively to help diagnose fungus infections of the scalp and erythrasma. The light causes hairs infected with a fungus such as Tinea capitis to become brilliantly fluorescent. Also called black light.
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Wood's lamp


[Gr. lampein, to shine]
A device for producing and applying light, heat, radiation, and various forms of radiant energy for the treatment of disease, resolution of impairments, or palliation of pain.

infrared lamp

A lamp that develops a high temperature, emitting infrared rays; a heat lamp. The rays penetrate only a short distance (5 to 10 mm) into the skin. Its principal effect is to cause heating of the skin.
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slit lamp

A lamp so constructed that an intense light is emitted through a slit; used for examination of the eye. See: illustration

sun lamp

Ultraviolet lamp.

ultraviolet lamp

A lamp that produces light with a wavelength in the range of 180 to 400 nm. It is used to treat certain skin conditions such as psoriasis or T-cell lymphoma, to promote wound healing by destroying bacteria, and to tan the skin. Ultraviolet lamps produce light within specific ranges: ultraviolet-A (UV-A) lamps generate light having a wavelength of 320 to 400 nm; ultraviolet-B (UV-B) produces light in the range of 290 to 320 nm; ultraviolet-C (UV-C) has a wavelength of 180 to 290 nm. Synonym: sun lamp


Patients and operators must wear ultraviolet-resistant goggles during treatment. Overexposure to ultraviolet light produces burning and blistering of the skin and may predispose patients to skin cancers.

Wood's lamp

Wood's filter.
References in periodicals archive ?
The coral-red fluorescence seen under the Wood's lamp is due to porphyrins produced by Corynebacterium minutissimum.
Examination on Wood's lamp revealed epidermal to be the most common type 12 (40%), closely followed by mixed in 9 (30%), and dermal in 9 (30%) patients.
These patients were compared on the basis of colour intensity, demarcation, scaling and Wood's lamp reflection scores on 1st, 7th and 14th day.
All patients were examined under Wood's lamp and classified into epidermal, dermal, mixed and indeterminate.
Upon wood's lamp examination mixed pattern was observed in all 30 patients.
Shining a Wood's lamp does not accentuate the lesion, helping to distinguish nevus anemicus from fungal infections that tend to fluoresce.
Because the spots can be difficult to see in very young infants, the child's skin should be examined with a Wood's lamp.
5) Melasma has also been divided into three types based on Wood's lamp and histopathological examination as: Epidermal (70%), dermal (10%) and mixed (20%).
This procedure may yield ambiguous results, since other infectious organisms may also glow under the light of a Wood's lamp and some strains of M.
It's therefore important to check patients with a Wood's lamp, she said.