I'm happy to hear you feel your dogs sight is improving.
If he is scratching his face, that would be due to pain. Is there any redness in the whites of his eyes? Does he squint or does the 3rd eye lid close up (the flap in the inner corner of the eye).
I have sent them about 5 emails, and they only replied to the first one, saying they would pass my comments onto their scientists. It is very frustrating as the product is so new, there is no feedback from people who have used the drops.