Imagine you have a wonderful Holland & Holland Royal Hammerless Ejector, but can’t shoot it, because you have got problems with your right eye. Worst case, but you have some options. First, you can try to switch to shooting from your left shoulder. Not impossible, but difficult for most people. Second, you can ask a good gunstock maker for a special cross over stock. It should be a really good maker, because this stock is much more difficult to do than a normal one.
This Holland & Holland was stocked by Frederik van Breen of Guns & Gunstocks from Holland. I think the pictures speak for themselves: