‌Blue light blocking glasses mainly reflect harmful blue light(380-445nm) by coating the surface of the lens, or absorb harmful blue light by adding blue light blocking factors to the lens substrate, thereby blocking harmful blue light and protecting the eyes. Blue light blocking glasses were originally designed to reduce the damage of short-wavelength light, including blue light, to human retinal cells, and can be used for age-related macular degeneration. Medical blue light blocking can be used to protect patients' glasses before and after eye surgery for cataracts and other eye diseases. Current studies have shown that using blue light blocking glasses with a specific blue light blocking rate at night can help wearers reduce the stimulation of blue light from electronic screens such as mobile phones, computers, iPads and TVs on retinal nerves and assist sleep.