01 - Photochromic Filter (Colour-Changing)
As the name suggests, colour changing lenses darken when exposed to a sufficient amount of ultraviolet (UV) light, and this effect is reversible in the absence of high exposure to UV light. Hence, they protect your eyes from harmful UV rays.
02 - Blue Light Filter
Lenses with blue light filter block out the harmful blue rays emitted from digital devices (i.e. Phone, Computer, etc) that might be causing eye strains experienced after long hours of screen time.