not that it makes you that much of a bigger target. It is more that it adds to your "face".
What I mean is - it is like the old joke for people with big noses, first you see their noses then 5 minutes later they arrive.
What the visor does is it lets you opponent know that you are coming around the edge of you bunker. Because it is so thin and in front of you face, some people think that just because their eyes are in behind a barricade that they are safe. Eric you are right, it doesn't make you that much bigger - I will never shoot after the edge of a visor - but I will watch where it is and wait for you to stick the rest of head out.
goose