https://ophthalmologybreakingnews.com/ocular-toxoplasmosis--causes-treatment-and-prevention

Once you have it, exposure that your body would fight off can cause a reactivation or immune overreaction that causes problems.

I think I originally caught it as a child in the sand pit (cat poo). Reactivated it from a rare burger maybe as an adult that caused problems.

For that example - I might go blind (or at least towards it) if I eat a rare steak. I keep having to send back burgers because they don’t cook them through despite me requesting that.