K.B.
I personally have a lazy eye but there is no physical signs of it. I knew I couldn't see properly before I was 5, but I didn't know how to explain it to my mom. At the end of Kindergarten, I had an eye exam and they found out then. They suggested that I wear an eye patch. I did as told until one day, at elementary school, when I literally walked into a basketball poll. Then it was too frustrating (and embarrassing) to use. So in middle school they suggested that I just wear it after school when I watched TV or drew. But it was again incredibly frustrating not to see. So much so that I would peek, as often as I could, around the patch or through the itsy, bitsy hole that the sting threaded through.
My recommendation: patch early and patch often. The more the bad eye is worked out, the stronger it will get.