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There are three things that contribute greatly to the effectiveness of reading glasses. They are; the amount of light available, the reading glasses strength, and the focal length (the distance to the point of desired focus). Since a stronger strength is better closer to you, and a weaker strength is better further away, were going to look at how to buy reading glasses at different strengths, for different tasks, so you can see what strength reading glasses might help you with tasks that vary from your everyday use.

0.5 reading glasses, or even reading glasses at 0.75, might seem to be strengths that could be avoided simply by moving the object being focused on further away, but what if your everyday strength reading glasses is 1.00, you used a computer monitor that was 30 inches away, and you used it for hours at a time? A 4.00 may seem like a strength suited only for bullies burning ants on a sunny day, but if you're regular strength is 2.00 and you are tying fishing flies or working on detailed fine jewelry, tasks that occur much closer to your face, it may be perfect.

What strength reading glasses are right for a specific task at a different distance than your everyday use? Gauge that as you would your everyday strength, but at the distance the task occurs. Hold something relevant at that distance and see what strength is initially most comfortable. See what strength feels most natural without your eyes having to work to focus.

The free shipping on two or more pairs of Ultimate Reading Glasses applies to different strengths as well as different colors, so take advantage of that if you need more than one strength to make your life more effective, and more comfortable!

What determines "quality reading glasses"? Quality can be defined by durability, but is that really the only determination? Can discount reading glasses be quality reading glasses? Are the best reading glasses just the ones the last the longest? How about clarity and uniformity of the lenses? Do comfort and practicality play a role in quality? What are the factors you consider when you think of "quality reading glasses"?​

Are there specific glasses for computer use that improve vision and/or promote eye health? There seems to be little objective information on the subject. A google search turns up lots of articles from companies trying to sell computer reading glasses, but not much else. Two issues do seem relevant. First, the distance from the computer screen to your eyes and second the use of a single magnification specifically for that distance. Second, the effect of "blue light" on the eyes and how to effectively reduce it.

The distance at which most people view a computer screen is usually further away than the distance at which they use their reading glasses for reading printed documents, papers, books and phones. Since a stronger strength is better closer and weaker strength is better further away it's only logical that a slightly weaker strength will be better at a slightly increased distance. Also, multifocal lenses can become distracting as we constantly have to tilt our heads up and down to find the "sweet spot" for the specific distance of our computer screen. Therefore, it makes sense for those who view a computer screen for prolonged periods to have a dedicated pair of "computer glasses" that have a single strength that is comfortable at the screen distance and does not require constant refocusing.

The amount of definitive research on the effects of reducing blue light, and how to effectively reduce blue light, is also minimal. There are companies that sell glasses with a yellow tint that supposedly reduces the blue light from a computer screen. There are also companies, that make apps for computers and smart phones that reduce the amount of blue light coming from the screen. Some of these apps can be set to reduce the blue light all the time, or adapt to the time of day. Reducing it more at night. I tried the most popular one of these apps, "f.lux" for about six months. I set it to reduce the blue light based on sunset, reducing it more at night. The screen is noticeably more yellow, but over time I notice that less. There is a "pause" function so that I can temporarily shut it off when I do need to see true color. My anecdotal findings are that it does seem to be much more comfortable and I don't need a special pair of glasses just for the computer. Of course, anecdotal findings are not scientific research. It may be that I just think it's working because I expect it to, so it appears jury is still out on the actual effects that everyone can expect.

You can find f.lux here: https://justgetflux.com/ ​

Here's an article on"f.lux, blue light, and sleep: Reduce Eye Strain And Get Better Sleep By Using f.lux On Your Computer