Gunnars do a great job at blocking UV and some kinds of glare, but they mostly don't block the light around 480nm, so they can't block all alerting light. You

Gunnars do a great job at blocking UV and some kinds of glare, but they mostly don't block the light around 480nm, so they can't block all alerting light. You want glasses that look orange (not pale yellow), like the $7 Uvex ones.