I've used PC Peekers about 4 years. They eliminate neck strain when using a computer with my progressive lenses. My husband uses them with his bifocals. The first 2 pair I had I purchased for $30 each from a doctor's office, and they were worth the cost. After breaking both pair, checked Walmart.com and found them for $17.88. I broke them each in the middle while cleaning the lenses. I figured out that if you hold on to he tab next to the side you're cleaning, they don't break. I had previously been holding them in the center between the lenses, and the pressure from cleaning caused them to snap in the center. The Walmart pair has not broken. I also have drilled a small hole in the tabs or just tied a ribbon around the small end of the tabs so i can hang them around my neck. The colored string or ribbon makes them easy to find if I happen to lay them down. Will not use a computer without them!

PC Peekers fill an important need for me. I have macular degeneration with reduced central vision, especially in my right eye. Before PC Peekers, I had to move close to my computer monitor screen and tip my head back far enough to read through my regular bifocal lenses. This resulted in extremely strained and sore neck and shoulder muscles. I also use them to get a better view of medicine labels and other fine print. My first PC Peekers were a gift from my ophthamalogist. Those lenses were not scratch resistant, but I didn't know that until they were already scratched. They are no longer usable. The scratches were a huge nuisance, and blocked part of my view. The PC Peekers I bought from WalMart are said to be coated with a scratch resistant substance. I've been very careful of them, and so far, no scratches. I had a dickens of a time getting the adhesive tabs that keep them from slipping on the right places. But I recommend PC Peekers highly. I also recommend extreme care to avoid scratching the lenses. I was told that this type of plastic cannot be buffed to eliminate scratches.