Ngozi ya kawaida ina uwezo wa kuchukua mwanga kulinda viungo na tishu kwenye mwili kutokana na uharibifu wa taa. Uwezo wa mwanga kuingiza tishu za kibinadamu unahusiana sana na wimbi lake na muundo wa tishu za ngozi. Generally, the shorter the wavelength, the shallower the penetration into the skin. The skin tissue absorbs light with obvious selectivity. Kwa mfano, keratinocyte kwenye corneum ya stratum inaweza kuchukua idadi kubwa ya mionzi fupi-wimbi la ultraviolet (wavelength ni 180 ~ 280nm), na seli za spinous kwenye safu ya spinous na melanocytes katika safu ya basal 4. 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.
Mchambuzi wa ngozican be used to detect deep skin pigmentation problems.Mchambuzi wa ngoziInatumia spectra tofauti (RGB, mwanga wa msalaba-polarized, taa sambamba-polarized, mwanga wa UV na taa ya kuni) kuunda miinuko tofauti ili kujua shida za ngozi kutoka kwa uso hadi safu ya kina, kwa hivyo wrinkles, mishipa ya buibui, pores kubwa, matangazo ya uso, matangazo ya kina, rangi ya rangi, rangi ya kuvimba.
