Scientists at the University of British Columbia and the University of Toronto have identified a previously unknown fluid drainage system at the back of the eye in mice. Named the posterior ocular lymphatic outflow, or POLO pathway, this network routes metabolic waste and fluid from the retina directly into the body's lymphatic system. For over a century, standard anatomy held that the eye lacked lymphatic connections in this region, making it difficult to explain how dense cellular waste was cleared from such a metabolically active tissue.
This discovery provides a concrete physical mechanism to investigate in relation to conditions like glaucoma and macular degeneration, where waste accumulation is a central factor. However, the work was demonstrated in mice, and translating these findings into human therapies will take years of additional study. It is a promising anatomical correction, but we are a long way from knowing whether this pathway can be safely targeted or enhanced in patients.
more: https://www.sciencedaily.com/releases/2026/10/261008005254.htm
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