Im not an optician, but my wife is. Here is her reply.

"Anyone who stares at a lighted screen is receiving unwanted blue light that can potentially harm the retina. Most eyecare professionals recommend buying blue light protective lenses. Usually this involves a blue light filter incorporated into an antiglare (non-reflective) coating. That provides sonewhere around 30% blue light protecton. Another method is Essilor's Transitions Extra-active photochronatic lens. This is a light changing lens that gets extra dark outside... BUT...it is supposed to block at least 80% of blue light, so it us valuable inside as well. Prices on these (and all other optical products) can vary greatly. Don't be afraid to shop around! The discount optical chains are just as good lenswise as the expensive stores, they just don't have the most expensive frames!"