Stefan Kim of SciShow explains why the sky appears blue to human eyes due to Rayleigh Scattering ... super good at absorbing blue light. …the deep, rich shade of blue we now see at twilight ...

Blue light, emitted from screens, penetrates deep into the retina ... resulting in symptoms such as eye fatigue, headaches, dry eyes, and blurred vision. The American Optometric Association ...

We like to call her "Eyes 9.'' Kathy Sabine's Colorado sky-blue eyes make all our days sunny regardless of her weather reports on KUSA, Channel 9. But we never miss her forecasts. Those eyes just have ...