Researchers uncover hidden lymphatic drainage pathway in the back of the eye
Scientists have identified a previously unknown drainage route, called the POLO pathway, that moves fluid and waste from the retina into the body's lymphatic system.
In a study published in Translational Vision Science & Technology, researchers revealed a hidden lymphatic outflow at the posterior eye, termed the POLO pathway. Using MRI, near-infrared fluorescence and microscopy in mice, they tracked tracer molecules from the retina into choroidal lymphatic vessels and onward to orbital tissues and lymph nodes. This contradicts the century-old view that the eye is isolated from the lymphatic network.
The discovery offers a new anatomical target for therapies aimed at improving fluid clearance in conditions such as glaucoma and age-related macular degeneration, which affect millions of Canadians. Lead investigators Neeru Gupta and Yeni Yücel highlighted the potential to develop treatments that enhance or exploit this natural cleanup system. Further work is needed to confirm the pathway’s role in humans and to explore safe ways to modulate it.
Why it matters
Understanding the eye's hidden drainage system could lead to new treatments for major causes of blindness.
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