They appear blue for the same reason the sky and water appear blue—by scattering light so that more blue light reflects out. People with no melanin at all have pale blue eyes. A newborn's eye color is ...
Many people have turned to blue light-blocking lenses to effectively filter harmful blue light encountered by increased screen time. While there isn't any solid research backing the use of blue ...
But they can distort colors. You may want different lens colors for the same activity in different conditions. For example, skiers often use gray or ... green and blue backgrounds, like grass and sky.