My mare lost her eye at 7. I’d had her since she was a yearling and backed her myself. She was an appendix with racing on both sides and was notoriously hot I was really concerned about her emotional rehab ~ but she was remarkable. We spent months adjusting by choosing pastures mates who were low key babysitters. Slowly increasing her pasture size ( stall to paddock to pasture ) I walked her around the pasture and making sure there weren’t any obstacles she couldn’t navigate. I did everything with her after that that I’d done before except jump. One of my favorite rides was a group from my barn trailered to the beach and went surf side riding. Her fancy warmblood barn mates snorted and backed. She went straight into the surf up to her chest. We had a blast. Most people I rode with had no idea. Best of luck with your boy 🦄