>1. The eye has immune privilege, similar to that of the brain, meaning it can tolerate antigens that would normally trigger an immune response elsewhere, like

>1. The eye has immune privilege, similar to that of the brain, meaning it can tolerate antigens that would normally trigger an immune response elsewhere, like your arm. This is my theory, too. I worked on optogenetics in the periphery and the immune response is catastrophic, often leading to loss-of-function worse than a pre-existing condition or trauma. The way we got around this was with immune response suppressants like Tacrolimus. [0] But my expertise dramatically drops off with CNS immunity, not to mention the eyes which I know very little about. [0] https://www.nature.com/articles/s41598-018-32075-0 https://www.nature.com/articles/s41598-018-32075-0