I wouldn't tell him that you found out about his eye injury/illness even if it in written in an article on the internet. After all, you found out by accident when you googled his name.
I woud wait and go with the flow until he is ready to tell you. Most people are self conscious about something and if he is wearing dark glasses and doesn't seem to look directly at you , it sounds to me like he is waiting to tell you, otherwise he woud have already said.
I still have my biological eye but I can get self conscious when meeting new people (in the work place) as I have a fixed dilated pupil. Once I went to a party frequented by people who worked in an eye clinic. Almost died when I heard one girl shout out..Oh you've got a dilated pupil. I didn't know what to say. What could I say.
Some men/ladies who are dating do very nicely wearing a patch and othe's I know here have never been short of a date, others don't explain their situation until they have to. I think it is all quite personal and depends on the situation and dating set-up.
I wish you well and good luck with the next date. He sounds like a very nice chap.