UV420 nm wavelength is a blue light that comes from artificial elements such as LCD Monitors, smartphones, tables and so.

Here you will find articles and links about UV420 and where to buy glasses to defend on your eye:

• Article about UV420 (Hebrew) 
• Zenni Optical – A place to buy glasses, but they have also UV420 glasses
• Gunnar – High class glasses for gammers  
• AliExpress
  • AliExpress – uv computer glasses
  • AliExpress – Computer glasses
  • AliExpress – blue light blocking glasses