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" ... But I found one flaw in the Duovids. I'm very nearsighted, and use an eyeglasses correction of about 6 diopters (that probably puts me well below the fifth percentile for eyesight in Americans). Using binoculars without glasses, I have to focus the binoculars beyond where they'd be focused for someone with good eyesight--that is, to focus on an object 30 feet away, I might have to set the binoculars as though the object is 40 feet away in order for it to appear sharp. That's not usually a problem: I can generally adjust the focus this way. The only place a problem might arise is when I'm focusing on something that's close to the binoculars' infinity setting, where the manufacturer has to provide room in the focusing mechanism to focus beyond infinity. And here the Duovids don't provide quite enough. Without my glasses, I can't get a clear image out of the Duovids when I look at something a couple of miles or more away, at least at 8x magnification (at 12x, the problem resolves, but just barely). Focusing on infinity is perfectly sharp when I'm wearing glasses--this is just a matter of design provision for people with terrible eyesight, and it's a provision that some other manufacturers make. ... "