No joke, Ryosuke and I actually have the exact same prescription eyeglasses. We figured this out on day three of our trip to Hakodate in Hokkaido. He accidentally fell asleep during the day in his contacts – and one ripped when he tried to change them out a couple hours later.
Jokingly, while leading him around the city later, I let him borrow my glasses. They ended up working perfectly for him (which, you know, was nice because that was day three of a two and a half week trip. He would have been miserable without eyesight for the next 17 days).
Since then, we’ve been sharing glasses on days he doesn’t feel like wearing contacts.