Get a copy of your prescription, go to Zenni's website, and enter the script. There's an option for getting a pair of glasses with blue light reduction specifically for sitting at the computer. They convert your Rx into a slightly different form measured for approx. 3 ft reading distance off screens. I've got 2 pairs, one for my computer, the other for driving/work. And yes, it works if you have bi/trifocals. That's taken into account.