Blue light emitting from screen of digital devices produces toxic molecules in retina which lead to macular degeneration – visual impairment.
Digital devices like smartphones, tablets and laptops use red, green and blue light to give a colorful visual on their screens. Blue light has short wavelength and more energy compared to other colors. This gives blue light more penetration power than other lights.
Retina, light sensitive part of eye, has photo-receptor cells which requires retinal molecules to sense light and signaling to brain, enabling us to see. Retina unable to block or reflect most of the blue light. Blue light triggers a chain of reactions when exposed to retinal. This produces toxic molecules in photo-receptor cells, which damages their membrane and kill the cells.