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Do reading glasses magnify objects that are at least two meters away from you?
Wiki User
∙ 14y ago
A curved lense of that shape magnifies anything.
Wiki User
∙ 14y ago
Reading glasses are typically designed to magnify objects that are within arm's length away, around 16-18 inches. They are not intended to magnify objects that are farther away, like those at least two meters away. For distant objects, regular prescription glasses or contact lenses are more suitable.
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What does 0.75 reading glasses mean in terms of magnifcation?
Simply put, it means you'll want your reading material about 1.33 meters away from your eyes. The letters will look about as large as they always do at a distance of 1.33 meters, but with the glasses on you'll be able to focus on your reading material comfortably.If you'd rather have your book or screen 1 meter away, use +1 diopter lenses; half a meter away, use +2 diopter lenses; 0.33 meters away, use +3 diopter lenses and so on. The closer you put the reading material, the larger it appears (just like always). Of course your mileage may vary, so use these numbers as a starting point to see what works for you.The general idea is that those of us with so-called "normal" vision (or vision that's been corrected to normal with glasses or contact lenses) are focused on objects a long way away when our eyes are relaxed. By using reading glasses and putting our reading material one focal length in front of the glasses, we make the reading material appear to be a long way away, without changing it's apparent size. The focal length of the lenses in meters is 1 divided by the power in diopters. One might say the purpose of reading glasses isn't to magnify, it's to be able to focus comfortably.Sometimes optics like magnifying glasses and telescope eyepieces are spec'ed in terms of magnifying power. Magnifying power can be calculated as the power of the lens in diopters, divided by 4. The idea here is that someone decided 250 mm is a reasonable value for the closest "normal" people can focus, so they use 4 diopters for the baseline to compare against when considering the apparent size of objects viewed through a magnifying lens.
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