As I get older, my short sighted vision has deteriorated (doesn't help that I'm on a computer the whole day long) and I wear reading glasses.
I'm currently on a 1.5 strength but the biggest problem I have is when I partake in sport. I'll go on a ride with mates and I never take my glasses because they are rather bulky. Likewise on a trail run. Bottom line is that when partaking in sport, I never have glasses, so trying to read a message on my iPhone is a fruitless exercise.
Anyways, this popped into my inbox a while ago and I eventually order a pair. Seems to me that they've solved my problem and if they don't work, they didn't cost a lot.
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Reading Glasses on your Mobile Phone | ThinOPTICS
Disclaimer: I have absolutely nothing to do with the Company