I purchased 4.0 High Magnification Power Readers. They have about an 8” focal length and I’m comfortable reading fine print on the page from 7 to 14 inches away.My computer screen is about 22 inches away, and the 4.0 High Magnification Power Readers are blurry to me at that distance, so I’m more comfortable using my 2.5+ reading glasses when I’m on the computer.I purchased these magnifying glasses so it would be easier for me to read books with fine print and they work great for that. They also work great for sheet music that is sometimes printed too small. These are good quality glasses and are the best magnifying glasses I’ve found. Yes, I would recommend these to a friend. In fact, I did recommend them to a friend.I also ordered the 4.5 and 5.0 versions of these glasses, and I’ll let you know how they work out.Update:The 4.5 magnification readers are comfortable for me to read fine print at from 7 to 12 inches away (focal length = 7”).The 5.0 magnification readers are comfortable for me to read fine print at from 7 to 11 inches away (focal length = 5½”).I didn’t see any appreciable difference in the clearness or size of the fine print when using the 4.0 magnification versus the 5.0 magnification. I use the 4.0 magnification to get a slightly greater focal range so it’s a little easier to hold the book at a comfortable distance.
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