You can’t legally buy anything that contains THC online. (THC is the active ingredient in Cannabis)
You can buy eye drops with CBD in them online
Search “CBD Eye Drops” and they are all over the place.
I’m truly not sure if the eye drops that the fellow in Jamaica was sending you contained THC or not? And I’m also not sure if THC could benefit you through the eyes?
Try the CBD Eye Drops and see if those help. if not there are ways to add MJ to it by growing your own or buying MJ Concentrate and adding it to the drops.