My head is on my neck which is flexible enough to allow me to move my head the fraction of an inch needed to cover any blind spot any glasses frame has. LOL The protection forom flying bugs or debris and the protection from UVA and UVB far outweighs any concern over a blind spot by the glasses arm. I have a pair of wraparound sunglasses that fit over my glasses and I cut the ears very sort on them and have an elastic band made from waist elastic. Easy on and they can be removed and/or hung from my neck.

Cheers