When I went to Germany a coupple of month ago I went to Rossman and they sold very cheap glasses, I think like for 3 € or so and just for fun I put them on.
But when I looked at my phone through them I was really surprised how sharp everything was. By pure luck I grabbed the ones which fir my own eye sight, so I bought them.
And I didn't think it would be such a change but I love them, they make it possible for me to read without squinting and holding things far away.
But especially with Korean characters which are so small that I really couldn't distinguish them it allows me to finally read them at all.
I constantly need to take them off because they are just for reading, but such a improvement in quality of life for 3 €.