Ocular immune privilege is a terrifying biological anomaly where your eyes have an entirely separate immune system from the rest of your body to prevent inflammatory damage to your fragile vision.

A closer look

Ocular immune privilege is a terrifying biological anomaly where your eyes have an entirely separate immune system from the rest of your body to prevent inflammatory damage to your fragile vision. If your primary immune system ever somehow breached the blood-retinal barrier and discovered the existence of your eyes, it would immediately recognize them as foreign objects and relentlessly attack them until you were permanently blind. You are currently living your daily life with two squishy spheres in your skull that must remain strictly hidden from your own internal defense forces, exactly like a biological witness protection program. It is deeply unsettling that the only thing keeping you from going completely blind is a microscopic border patrol preventing your overly aggressive white blood cells from finding out you possess the incredible evolutionary ability to see your immediate surroundings