First, enjoy your little one while he's a baby, this is his fun time. I've had a few ASD babies (before I researched and learned of ASD) we had thought that they were just "simple", didn't realize it was a sight thing, poor little ones. I still have two of my ASD effected mares, they are pets now, one did well in the show ring in her day but her sight is REALLY poor now, she has a buddy in the herd that keeps watch over her, the second mares sight isn't effected that that badly, the eyes are obviously deformed but she seems to see fine and get around just fine.
One thing to look into for him is a GOOD therapy group to donate him to, he could be placed with a nice family and have a wonderful life, just research the groups WELL, make sure you can check up on him any time you want. A friend and I recently had a VERY disappointing experience with one of the well known placement groups, the horses have disappeared, no one can tell us where they've gone, so research carefully.
There is no reason for him not to live a good and full life if it is ASD, he just needs the right home, and KUDOS to you for researching and making a good decision for him!
Oh, have also had two other blind mares, they were older broodmares and best of buddies, I knew the one was almost blind, she followed her buddy EVERYWHERE, one day the buddy had an eye injury and while the Vet was examining her she ask if I realized that SHE was basically blind! She had scar tissue in the eyes probably from injuries long before I bought her, she had about 10% sight in one eye but you'd NEVER EVER know it, she got around 20 acres like a pro, so we had the blind leading the blind and didn't even know it, lol.
krisp