I first noticed my retinal scarring when I was a teenager. I mentioned to my mother that I saw floaters. She thought I needed glasses and took me to an optometrist. When he dilated my eyes, he saw the retinal scar tissue.
In my case, it is caused by congenital toxoplasmosis (which can make people a whole lot sicker than me). My mother must have picked it up while she was pregnant with me through exposure to cat feces. (Probably in the garden; we had outdoor cats. Strictly indoor cats rarely carry it.)
At any rate, toxo is not curable and could sort of reactivate at any time; then it causes inflammation as well. In the meantime, I've developed an astigmatism in that eye that might be related to the condition, and the scarring causes distorted vision in that eye. I often find myself closing it to see better far away.