There are no crosshairs in real life...unless you're looking through a sight.
Hmm, you
COULD have a crosshair if you wear some kind of goggles and paint/draw a crosshair on it, but it would need to be drawn on both sides so both eyes can see it and it would look as if it were together, like how the two parts of my glasses are oval shaped, but when i look through them (Instead of looking at them in a mirror or off my face), it looks like one big oval shape :D