I have a friend who has been taking HCQ for a chronic illness since long before the pandemic, as it’s been historically used for. They have to go in for regular retinal checks to ensure that they aren’t going blind, and they are other significant concerns. They’re on it because those risks aren’t as bad as the effects of their chronic illness that HCQ relieves. But those risks are still bad. And if HCQ doesn’t help, then they definitely don’t want to give it out to everyone.
Assuming that’s true, then that risk is associated with chronic intake of HCQ. But the recomended use against Covid is to take it only after noticing symptoms, and before hospitalization. It’s a short use.