Japanese glass shops are excellent, so lens selection will also end easily.
(except special lens required)
Even if you can not speak Japanese, it will be fine if you speak only in English.
BC in Tokyo many foreigners also livin' as workers and students.
Shops such as large shopping malls where families visit more than large stores are recommended.
This is one of glass shop blog with reports with kids over 1000 posts.
(kids with machine pics are just a "experience".)
If you find a person wearing glasses, ask a question in Japanese.
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すみません、私はアメリカから旅行で日本に来たばかりなのですが、
品揃えの多いメガネ屋さんも探しています。
もし良ければ、都内かこの近くのオススメのメガネ屋さんを教えて貰えませんか?
横幅の狭いフレームを探しているので、こども用の商品も多いと嬉しいです。
Sumimasen, Watashi wa America kara ryokou de Nihon ni kitabakari nano-desuga,
shinazoroe no ooi Megane-ya-san mo sagashite imasu.
Moshi yokereba, osusume no megane-ya-san o ikutsuka oshiete morae-masenka?
Yokohaba no semai flame o sagashite irunode, Kodomo-yoo no shohin mo ooi to ureshii desu.(copy to below and click speaker icon)
http://voicetext.jp/(if felt faster change to slower speed/速さ 70 or 80 fr 100)
Excuse me, I just came to Japan on a trip from America,
I am also looking for eyeglasses shops with a lot of samples.
If you do not mind, could you tell me some of the recommended glasses shops in Tokyo or near here?
Also I am looking for narrow frames of width, so I am happy that there are many goods for children.
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If you couldn't speak perfectly, just showing cellpone or tabletPC display or paper as memo.
(Pls don't forget say "Thank you for your help!" = ありがとうございます。とても助かりました。)
日本(Nihon) : Japan
オススメ (osusume): recomend(s)
メガネ屋/めがね屋/眼鏡屋(Megane-ya) : eyeglass shop (most Japanese calling "Megane-ya-san")
"-san" means one of basic "honorifics", but using widely not only for human.
https://en.wikipedia.org/wiki/Japanese_honorificsThis "-ya" means just a "shop" or "store", many cheaper restaurants also used.
探して-いる/-います。(sagashite-iru/-imasu) : (now) looking for
This is famous Taiwanese YouTuber visited "J!NS", she speaking in Taiwanese(one of Chinese).
https://youtu.be/v6Y5uliCZG8 (1:38 "童鏡" means Children glass)
https://www.jins.com/jp/st/kids/This is another Taiwanese visited "Zoff".
https://youtu.be/_MjJDTmhSuYThis is J!NS in Taiwan quick report. (Taiwan is not Japan)
https://youtu.be/VO2vWWzTVH0You can see the a lot of many lens stocks.
Shop staff said "30 min possible" as fastest buy.
This is French YouTuber report speking in French.
https://youtu.be/QOJesazShdQShe does not live in Tokyo, but she doubted the Japanese boyfriend's answers,
however, she explained how surprised I could easily do eye test
and got best one as good price 7000Y(64USD/today's rate).
This is eye test chart of Japan, just answering/saying directions of open mouth(cutted part).
http://shiryoku-care.com/_src/15004/img20160125211630745799.jpg
This chart is not only in Japan.
https://en.wikipedia.org/wiki/Landolt_C(Most Japanese don't know this real name "ランドルト環 : Landolt-kan".)
(this "-kan" means "a ring" using another Kanji "輪: wa" mostly )
Anyway, finding not so hard no worry,
but some shop staff said "no recommend doing eye test in later time(after noon)",
bc, if you visited at later, yr eyes already tired will be worse result out,
so they selected a not best lens will be Dizziness, Headache, or Nausea in the daytime no good.