They are difficult to see because everyone is different. It didn't work for me because medium and long distances didn't work, but reading did. So spending money would be a waste for me. I REALLY think their farsightedness isn't as far as they think as for me it's blurry at about 4ft, but at medium distances my vision is perfect. I would say if you have poor vision reading or at medium to long distances you may have stigma and I'm not sure these glasses will work.
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