Tá an cumas ag gnáthchraiceann solas a ionsú chun na horgáin agus na fíocháin sa chorp a chosaint ó dhamáiste solais. Tá cumas an tsolais chun fíochán daonna a chur isteach go dlúth lena thonnfhad agus le struchtúr fíochán an chraicinn. Generally, the shorter the wavelength, the shallower the penetration into the skin. The skin tissue absorbs light with obvious selectivity. Mar shampla, is féidir leis na keratinocytes sa stratam corneum cuid mhór de ghathanna ultraivialait ghearr-thonn a ionsú (is é an tonnfhad 180 ~ 280nm), agus na cealla spinous sa chiseal spinous agus na melanocytes sa chiseal basal ~ ~ ~ ~ 400NM). The skin tissue absorbs different wavelengths of light differently, and most of the ultraviolet rays are absorbed by the epidermis. As the wavelength increases, the degree of penetration of light also changes. Infrared rays near the red light machine penetrate into the deepest layers of the skin, but are absorbed by the skin. The long-wave infrared (wavelength is 15~400μm) penetrates very poorly, and most of it is absorbed by the epidermis.
anailíseoir craicinncan be used to detect deep skin pigmentation problems. Ananailíseoir craicinnÚsáidtear speictrim dhifriúla (RGB, solas tras-pholaraithe, solas comhthreomhar-polarized, solas UV agus solas adhmaid) chun tonnfhaid éagsúla a chruthú chun fadhbanna craicinn a fháil amach ó dhromchla go dtí an ciseal níos doimhne, mar sin is féidir le roic, le féitheacha damháin alla, le poill mhóra, le spotaí dromchla, le spotaí domhain, le lí, le lí, le hathlasadh, le porphyrinsin agus le fadhbanna craicinn eile beacha a bhraitear.
