Researchers from the University of British Columbia and the University of Toronto have discovered a drainage route at the back of the eye. In experiments with mice, they found that fluid could leave this region and enter the lymphatic system. This network helps the body remove waste, balance fluids, and defend against illness. The researchers named the route the POLO pathway.
The retina, the tissue at the back of the eye that responds to light, uses considerable energy to produce signals for the brain. This activity creates waste that needs to be cleared away. A buildup of fluid and waste is linked to diseases that can permanently damage sight, including glaucoma and age-related macular degeneration.
The team followed molecules that gave off light to track fluid movement. These markers reached nearby lymph nodes within minutes. Researchers still need to establish how the pathway functions in humans and whether changes in it contribute to disease. Improving drainage could eventually help protect vision, but this remains a possibility for future treatment rather than an established therapy.
