Kathmandu, Feb. 19 -- From smartphones and laptops to tablets and LED lighting, screens are now integral to everyday life. As people spend longer hours in front of digital devices, questions are being raised about how blue light exposure affects the skin.

Dr Saroj Poudel, a dermatologist and hair transplant surgeon, is the director and co-founder of Nirvana Skin Clinic and Hair Transplant Centre, Lazimpat, Kathmandu. He explains how to protect the skin in a screen-dominated world.

How is the blue light emitted from phones and screens different from natural light, for example, sunlight?

Sunlight contains a balanced spectrum of visible and invisible light. Blue light is a high-energy visible (HEV) light with a short wavelength. It is nat...