Too much light in the ultraviolet and blue-violet bands can permanently damage the human eye. As well as leading to painful inflammation of the conjunctiva and cornea, it can also cause damage to the eye's crystalline lens (e.g. cataracts) and especially to the retina (macular degeneration). That's why it's so important to wear sunglasses with 100% UV protection in strong sunshine to properly protect our eyes, especially in situations where there is a lot of glare such as on water or snowy mountain slopes – and that applies to children's eyes, too.
What about frequent indoor exposure to light sources with a high proportion of blue light?
Increasing attention is being paid to the strong blue light component of light-emitting diodes (LEDs) and energy-saving bulbs and the electromagnetic radiation from displays such as smartphones, computer screens, tablets and e-readers.
The good news is that none of the studies carried out so far suggest that using computer displays or staring at these new sources of light for long periods of time damages the retina. And it's important to remember that spending one hour outside on a normal overcast day exposes our eyes to 30 times more blue light than spending one hour inside sitting in front of a screen.
Nonetheless, the fact remains that blue light radiation from light sources or screens can be irritating or tiring for some people's eyes.
ZEISS eyeglass lenses with DuraVision® BlueProtect can help remedy this situation. The clear lenses feature a new lens coating which contains a hard coating and Clean Coat technology to make them easier to clean, as well as a blue filter which attenuates blue light in the 390 to 440 nm band.
That means improved visual comfort for anyone seeking protection against blue light during indoor activities – all without losing the beneficial effects of blue light in the 450 to 500 nm band! Spectacles with DuraVision® BlueProtect can be worn all day long, just like normal spectacles. For all outdoor activities in the sunshine, however, sunglasses or self-tinting lenses such as ZEISS PhotoFusion – both of which offer 100% UV protection – are still the recommended choice.