Is all blue light harmful? No, blue light is naturally occurring part of our atmosphere and we actually need a certain amount for optimal health and development.
Is all blue light healthy? No, indoor artificial blue light that is admitted from fluorescent/LED lighting and lighted T.V., tablets and hand held device screens has long been known to cause vision fatigue in people of all ages. Further studies are required to understand the full impact on retinal health.
Why does it cause vision fatigue? Blue light in the light spectrum causes haze in the atmosphere. When you are looking at a lighted device it is difficult work for your eyes to hold focus on any object inside your arms reach for long periods of time.
How do blue light inhibiting lenses help? A good quality blue inhibiting lens will reduce the amount of blue light visible to your eye, thereby increasing contrast and making it easier for your eye to create sharp focus for longer periods of time.
Are all blue inhibiting lenses equally effective? Not every pair of glasses labeled blue-inhibitor is fully effective because they do not filter enough blue light to make a difference in vision comfort. The percentage of blue light or High Energy Visible light that is filtered is what determines full effectiveness. Ask your optician for suggestions.