https://sciencing.com/effects-visible-light-radiation-5580513.html The eye occupies less than 2 per cent of the whole body surface area, but it represents the sole organ system to allow the penetration of visible light deep into the human body. Ultraviolet (UV) radiation that reaches the Earth’s surface is in wavelengths between 290 and 400 nm (nanometers, or billionths of a meter). During human evolution a number of mechanisms have evolved to protect this very sensitive organ against harmful effects of the sun's rays: People and plants live with both helpful and harmful effects of ultraviolet … Abstract PIP: This article explores the influences of light on human health and suggests that exposure to artificial light may have harmful effects. Since UV light is blocked by the lens inside the eye it is the visible light that can harm the retina. Until recently, visible light (VL) had been regarded to be without significant photobiologic effect on the skin. . Since it is thought that blue light can damage the retina, ophthalmologists can now offer blue-blocking lens implants when performing cataract surgery. • You can read more about the effects of blue light at Artificial Lighting and the Blue Light Hazard at Prevent Blindness. Despite a lack of any concurring scientific evidence, HEV light has sometimes been claimed to be a cause of age-related macular degeneration. On the other hand, they can cause photodegradation and thermal damage. Effects of blue light and sleep. Ultraviolet light UV is found in sunlight and is a form of EMR with high frequency waves. •Have lenses that are perfectly matched in color and free of distortion and imperfection. The effects of visible light radiation vary according to their range and exposure. The visible light radiation can exert various biologic effects such as erythema, pigmentation, thermal damage and free radical production. Updated research suggests that this is not the case and the measurable effect of visible light on the skin is being documented in all skin types. This is shorter than wavelengths of visible light, which are 400 to 700 nm. Individual and combined effects of the infrared, visible, and ultraviolet light components of solar radiation on damage biomarkers in human skin cells. If you participate in potentially eye-hazardous outdoor work or sports, your sunglass lenses should be made from polycarbonate or Trivex ® material. The non-ionizing UV spectrum has a wavelength shorter than that of visible light but longer than an X-ray (100 nanometers [nm] to 400nm) and is categorized based on intensity: . On one hand, visible light waves are responsible for life on earth, as they boost natural processes like photosynthesis. The biological effects of UV radiation depend on the wavelengths concerned. •Have lenses that are gray for proper color recognition. High-energy visible light (HEV light) is high-frequency, high-energy light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of biological effects, including those on the eye.. . Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. Blue light rays (400 nm to 470 nm) are adjacent to the invisible band of UV light rays: • There is increasing evidence that blue light is harmful to the eye and can amplify damage to retinal cells. Screen out 75 to 90% of visible light. The effects of ligght on mammalian tissue are either direct or indirect, depending on whether the immediate cause is a photochemical reaction within the tissue or a neural or neuroendocrine signal generated by a photoreceptor cell. While light of any kind can suppress the secretion of melatonin, blue light at night does so more powerfully. 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