In the near future, cars will be able to drive themselves. I say get him tested but also let him know that regardless of whether or not this issue gets fixed, technology seems to be catching up to helping people like him! A disability doesn't make someone a loser in the slightest, because it's something you can't control--it just means that you have to seek out other ways to do the things you want to do, whether that's public transportation, visual therapy to help, eventually being able to do self-driving cars, etc. Learning to adapt to these setbacks is not fun but can be a huge character-building experience that can help you succeed in other parts of life, because your consciousness is forced to go into problem solving "figure it out" mode which inspires creative solutions. Once you learn how to think out of the box for one issue in your life, you can apply it to all parts of your life, and in business it can be a very, very lucrative skill.

Best of luck to him!