@mdstevens0612 Ear-protection is not necessarily required. Air guns are not very loud (but in smaller rooms the popping noise may still produce loudness spikes from which one wants to protect) but the surroundings (e.g. the audience) are. So wearing any kind of noise protection here is just for concentration and follows personal preference.
Same with the glasses: most shooters in static precision shooting prefer to focus on their primary eye. Closing the other would lead to squinting and...
@mdstevens0612 ...a change in focus in the dominant eye. Therefore, they wear an occluder over the non-aiming eye instead to reduce distraction without the need to close that eye. However, not everyone needs that. One can train to just ignore the input from the other eye. Or if you don't see very well with it anyway, you can more easily focus on the dominant eye and thus don't need to block the other (that's the case for me).