the wavelength of electromagenic waves from 100 to 400nm are called UV :

1. wavelength from 315 to 400 nm are called UV paragraph A ,which is one of the main cause of cataract.
2. wavelength from 280 to 315 nm are called UV paragraph B ,which is one of the main cause of acute corneal

conjunctiva.
3.wavelength below 280 nm are called UV-C,which is harmful for life to grow and develop.

Please concern your work and living envoriment,protect your eyes ,choose,use and wear the suitable sunglasses.