The sun’s rays damage the DNA of the cell and these damaged cells then form large numbers of identical cells which have a rapid rate of cell division. When eyelids and other periocular tissues are affected, the diagnosis of solar blepharitis is made.
BLACK LIGHT INK TATTOO FOR LIVESTOCK SKIN
The result is that blood vessels in the deeper skin layers dilate, turning the skin and eyelid very red and giving it a nasty inflamed appearance. When there is reduced melanin in the skin or eyelid, the strong UV rays can harm the cells.
Melanin is a pigment that absorbs the energy of the UVA and UVB light and helps filter these rays, thus reducing the damage to the outer skin layers. Normally pigmented eyelids have melanin-containing cells. UVA and UVB mainly contribute towards skin damage when no or reduced melanin pigment is present in the skin. ģ] UVC type of radiation is the most destructive, but fortunately, is absorbed in the ozone layer around the earth. This pigment forms a protective barrier preventing the UV light from reaching and damaging deeper lying cells.Ģ] UVB causes intense damage to the outer skin layer called the epidermis, resulting in sunburn, inflammation, ageing changes and most importantly leading to a type of skin cancer termed squamous cell carcinoma.
The melanin pigment produced by these cells absorbs the radiation into the cells of the skin or eyelid in animals that have these cells.
1] UVA rays penetrate the skin by about 1.5mm and cause increased stimulation of the pigment-producing cells in the skin, called melanocytes.
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