Is there an ophthalmologist who is good at multifocal diagnosis?

Since a few years ago, I can't see close-up text, so I have to take off my glasses to read books or KakaoTalk messages, which is really annoying.

If you go to an optical shop and get cheap frames and multifocal glasses, they usually cost 250,000-300,000 won.

I've gotten it right several times, but when I listen to the explanation, I feel like I can see things up close well, but I don't know if it's because I'm not used to it or because it's annoying, but then I can't see things well again, so I just take off my glasses when I look at things up close.

I went without wearing glasses for a few months, but it was so uncomfortable that I got a new pair, and this time it seems to have gotten better.

I wonder if this is a problem of adaptation or if I should get my eyes examined in detail. Rather than just getting glasses fitted at an optical shop, I would like to get a precise diagnosis at an ophthalmologist.

If you know of a good ophthalmologist in Gangbuk-gu, Seoul, please recommend one.

Even if it's not Gangbuk-gu, I think I definitely need to go to an ophthalmologist later.