I don't suppose anyone can explain why I get a massive headache whenever I see someone using a green laser pointer?  It is immediate and throbbing.,(reply>), So you're not neurotypical. Welcome, brother!<br><br>Srsly, if it's a problem in daily life (large green billboards, etc.) I'd check with a doctor.,(reply>), @N.L. Morrison I suppose it could be. I did notice that I can't see the light from black lights in one eye.,(reply>), Green lasers tend to be extremely bright.,(reply>), Trauma?