To stop back light I made a top cover for my welding helmet 10 x 12 "out of 2 mm black polyethene , it's pop riveted from the inside of the mask and has a steel washers on the rivet bodies to stop the rivets pulling through .. riveted in three places about 1/2 " from the back edge at the top of my head . About four inches from the front of the cover I warmed it up and bent it to about 30 degrees so it goes over my bump of knowledge . It stops any light getting in past my head or ears , allows me to breath easily with a face.dust mask on and makes me look a bit like a crested grebe . I too have taken to flooding the welding area with a 30 watt led flood light from about 18 " away I also wear a pair of reading or computer use glasses .. it makes a tremendous difference as my eyes each need different strength optics . As i got older & type two diabetes got to work on me I have to have new glasses every four years , using the 12 pairs of old ones in the mancupboard & 3D printer room . Have to carefully bend the arms for a tighter fit than normal so I can lean over to look at my toes with the glasses stay put on my head .