時域擬光譜法模擬分析角膜與眼白結構對光穿透特性的影響

Abstract

膠原纖維 (collagen fibril)在人體中十分常見，其光學特性為不透明。角膜與眼白兩者均由膠原纖維束組成，鞏膜呈現不透明的白色，但角膜卻是透明。利用時域擬光譜法（pseudospectral time-domain, PSTD）技術，模擬光傳播經過角膜與眼白模型之光學特性，分析不同變因對穿透率有如何的影響。接下來的章節中，會先探討厚度與入射波長對穿透率之影響；接著利用雷達散射截面 (radar cross-section, RCS) 來分析兩種模型的散射光特性；最後進一步考慮水造成的影響考慮進去，與真實實驗中，角膜與眼白之穿透率進行比較。

Both consist of collagen fibrils, sclera is opaque whereas cornea is transparent for optical wavelengths. By employing the pseudospectral time-domain (PSTD) simulation technique, we measured and analyze the scattering characteristics of light of the cornea and sclera with different sizes and arrangements of the non-bsorbing collagen fibrils. Various factors are analyzed, including the wavelength of incident light, the thickness of the scattering media, position and size distribution of the collagen fibrils. Simulation results show the arrangement of collagen fibrils and the wavelength of incident light interrelated with the transmittance.