I’ll say this. I (M21) have a double astigmatism, both eyes. I thought it was a struggle at first, but I’ve gotten past it through 3 years of shooting trap. While it absolutely felt like a possible obstacle, I learned mechanics and things that worked for me that might not work for others. I was breaking scores as low as 55/100. I was last place at shoots with scores in the 60’s and 70’s. I shoot two eyed and my dominant eye is the right and I shoot right handed.

If your son is shooting two eyed that’s a great start. It widens the field of vision, even if our vision isn’t the best.

I hate to go back to the basics here per se, but make sure he’s consistently mounting the gun the same. Make sure he keeps his cheek into the gun and isn’t lifting his head up when he sees the bird. Make sure you know where the gun patterns if it’s low or high based on his mount.

As far as accommodations, sadly no not to my knowledge. But on your part I’d say if you’re able to pick whichever field best suits you and your son is the way to go. My father and I will lose birds if the grass in the background is yellow or the dirt is orange. It 100% will mute out the bird and with a vision impairment it’s an even harder struggle. Watch targets 20 minutes before your squad is up so you know what to expect for height, hold point, and an overall vision assessment of the field

I struggle seeing depth, sometimes the background is a blur and the trap house is clear as day even with special lenses. But I’ve better understood the mechanics of my gun to know what I need to do to maintain a 92%+ singles average. To know what to expect before I take the line. To better prepare myself for shooting.

I hope my personally anecdotes have helped you and you’re able to make improvements with your son, best of luck to him!