Journal
OPTICS EXPRESS
Volume 13, Issue 15, Pages 5791-5797Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.005791
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Collagen, as the most abundant protein in the human body, determines the unique physiological and optical properties of the connective tissues including cornea and sclera. The ultrastructure of collagen, which conventionally can only be resolved by electron microscopy, now can be probed by optical second harmonic generation (SHG) imaging. SHG imaging revealed that corneal collagen fibrils are regularly packed as a polycrystalline lattice, accounting for the transparency of cornea. In contrast, scleral fibrils possess inhomogeneous, tubelike structures with thin hard shells, maintaining the high stiffness and elasticity of the sclera. (C) 2005 Optical Society of America.
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