Optical properties of the human skin / Optičke osobine ljudske kože

Open access

Abstract

Visual perception of human skin is determined by the light that reflects off the skin surface to retina and interpretation of these information by visual centers in the brain cortex. Skin has a partly translucent and turbid structure and visual perceptions depend on interactions between the light and structures of the skin surface and below it, through absorption, reflection and scattering. Light absorption by the skin depends on the composition, absorption spectra and amount (volume fraction) of chromophores. Subsurface scattering occurs within the skin layers: Rayleigh scattering (subcellular structures sized up to 1/10 of incident wavelength) and Mie scattering (collagen, melanosomes). Due to fluctuations of the refractive index within tissue components and intense scattering, the spatial distribution of light within the skin is diffuse. Skin images are created by the light that reflects off the skin after being color-modified by absorption and being scattered on the skin surface and internal skin structures.

Sažetak

Vizuelni utisak o ljudskoj koži potiče od vidljivog svetla, koje sa površine kože dolazi do mrežnjače oka, i interpretacije tih informacija u moždanim centrima za vid. Koža je delimično translucentna mutna sredina; vizuelna informacija potiče od interakcija svetla i struktura površine i ispod nje, putem procesa apsorpcije, refleksije i rasipanja svetlosti. Apsorpciju svetlosti u koži određuju sastav, apsorpcioni spektar i količina (volumen tkivne frakcije) hromofora. Rasipanje unutar tkiva ima dve glavne komponente koje rasipaju svetlost po Rayleigh modelu (sitnije čestice) i Mie modelu (krupnije strukture kolagena, elastina, melanozomi).

Usled velikih fluktuacija u indeksu prelamanja unutar tkiva, i intenzivnog rasipanja, prostorna distribucija svetla u koži je difuzna. Slika kože koju ljudi registruju posledica je svetlosti koja izlazi iz kože, nakon modifikacije boje (apsorpcija) i rasipanja na površini kože i strukturama unutar nje.

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Serbian Journal of Dermatology and Venereology

The Journal of Serbian Association of Dermatovenereologists (SAD)

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