Modern digital devices & lighting emit blue light
Most digital devices (smartphones, tablets, computers and modern TV screens) as well as LED and Xenon lights contain a higher proportion of blue light. Blue light regulates the circadian rhythm to ensure alertness in daytime and allow for restful sleep during the night. Viewing these at night can disrupt the brain’s production of melatonin, causing sleep disturbances and a dysfunction of the natural circadian rhythm. Zeiss DuraVision BlueProtect lenses filter the undesirable wavelengths between 440nm and 465nm, while allowing the beneficial blue light through.
ZEISS DuraVision BlueProtect coating
If you mainly wear your glasses indoors, you don't really need a UV block. However, DuraVision Blue Protect blocks blue light radiation irritating or tiring some people's eyes. A blue filter can give sharper vision as different wavelengths are refracted slightly differently by the cornea (front surface of the eye) and the lens within the eye. Not all of wavelengths of light strike at the same focal point on the retina.
DuraVision BlueProtect lenses can be worn all day long unless you wish to wear sunglasses for outdoor activities which also offer 100% UV protection.
Buy Zeiss Blue Protect coating online, just add this item to your basket (once for each pair of prescription glasses).