![]() ![]() Conversely, because of its cutaneous biologic effects, visible light is used for the treatment of a variety of skin diseases and esthetic conditions in the form of lasers, intense pulsed light and photodynamic therapy. Furthermore, a number of photodermatoses have an action spectrum in the visible light range, even though most of the currently available sunscreens offer, if any, weak protection against visible light. It has also been shown that visible light can induce indirect DNA damage through the generation of reactive oxygen species. As a result of advances in the understanding of skin optics, and comprehensive studies regarding the absorption spectrum of endogenous and exogenous skin chromophores, various biologic effects have been shown to be exerted by visible light radiation including erythema, pigmentation, thermal damage and free radical production. The goal of this review is to highlight the effects of visible light on the skin. The effects of visible light and infrared radiation have not been, until recently, clearly elucidated. Although photobiologic studies of sunlight date back to Sir Isaac Newton in 1671, most available studies focus on the UV radiation part of the spectrum. Typically, the human eye can detect wavelengths from 380 to 700 nanometers. More simply, this range of wavelengths is called visible light. The borders of each region are approximate. The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. 1: The electromagnetic spectrum, with its various regions labeled. NASA's scientific instruments use the full range of the electromagnetic spectrum to study the Earth, the solar system, and the universe beyond. Visible light range comes under the range of EM spectrum between infrared and ultraviolet, having a frequency of about 4 x 10 14 to 8 x 10 14 cycles per second and wavelengths of about 740 nanometres or 2. Lower in the spectrum are infrared rays and radio waves. ![]() A radio detects a different portion of the spectrum, and an x-ray machine uses yet another portion. Visible spectrum is a field of the electromagnetic spectrum that is visible to the human eye. Light is generally defined as the electromagnetic. Electromagnetic radiation has vast and diverse effects on human skin. The human eye can only detect only a small portion of this spectrum called visible light. The visible part of the electromagnetic spectrum to a human eye is referred to as the visible spectrum. ![]()
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