Soluble extracellular proteoglycans in corneal and trabecular meshwork tissues contribute to the stromal transparency in the corneal tissues and the resistance of the aqueous humor outflow in trabecular meshwork tissues. In retinal tissues, chondroitin sulfate and heparan sulfate proteoglycans are not only secreted into the extracellular space of retinal tissues but also expressed in the membrane of the retinal cells, contributing to the neural network formation and the maintenance of the interphotoreceptor matrix.

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