B.R.
I don't know if it's malpractice, but it's definately negligence on the part of the old eye doctor. If you are thinking about suing, you need to think about a few things. What would you sue for? You won't get tons of money. You might get any additional eye care paid for by them. What additional eye care will he need now because of this? You would need to get all this documented. Have you contacted the old doctor? Did they seem willing to work with you? The old eye doctor can decide not to cooperate with you. It has been two years. They could say that the glasses were tampered with. They could say that you were negligent in not getting a follow up appointment for two years (most kids get an eye exam every year, and you waited two years to have him checked again). Just some things to think about.
This is terrible. I feel so bad for you and your son. I can't believe that an eye doctor gave you glasses with just plain glass in them! You must be so upset. Contact a lawyer for a free consult and see what they tell you. Document everything along the way. Good luck and let us know what happened!