I needed a pair of glasses for when I'm working on the computer, I'm not a fan of bifocals as I cannot get used to them. I was using my cross stitch magnifier but that was giving me a headache. I ordered a special pair from Zenni optical for computer use and I got them today. I had to crunch the numbers on the prescription to make them single vision and then added a 10% yellow tint. What a difference the tint makes, it cuts down on the whiteness of the screen, no more headaches and just the right power for magnification. They work great at the computer and work for reading, not much anything else.