How to Say "Astigmatism" in Japanese

乱視

ranshi[ɾã̠ɰ̃ɕi]

Astigmatism is translated into Japanese as 乱視 (ranshi).

乱視 is a noun used to describe a vision disorder where the eye does not focus light evenly, resulting in blurred vision.

Meaning: disorder of the vision (noun)

How do you pronounce it?

ranshi

The character 乱 in 乱視 is the same character used to describe a 'rebellion' or 'riot' in a historical context.
Japanese speakers often use the word 乱視 in casual conversation to describe the 'starburst' effect seen around city lights at night, rather than just as a medical diagnosis.
The word 乱視 is composed of 乱 meaning 'disorder' or 'chaos' and 視 meaning 'sight'. While English uses a Greek root for 'point' or 'focus', Japanese describes the condition as 'chaotic vision'.

強い乱視はコンタクトレンズのほうが矯正できます。
Contact lenses are more able to correct strong astigmatism.
This sentence is useful for discussing how contact lenses can correct strong 乱視.
Tatoeba #74221 by fcbond, translation #329499 by fcbond
彼は少し乱視があるようです。
Kare wa sukoshi ranshi ga aru you desu.
It seems he has a bit of astigmatism.
乱視のせいで、文字が二重に見えます。
Ranshi no sei de, moji ga nijuu ni miemasu.
Because of my astigmatism, the letters look double.

Hiroto and Yui are talking about their eyesight.

大翔 Hiroto

結衣さんは、視力検査で何か言われましたか？
Yui-san wa, shiryoku kensa de nanika iwaremashita ka?
Yui, did they tell you anything during your eye exam?
結衣 Yui

実は、少し乱視があるみたいです。
Jitsu wa, sukoshi ranshi ga aru mitai desu.
Actually, it seems I have a bit of astigmatism.
大翔 Hiroto

そうなんですね。生活に影響はありますか？
So nan desu ne. Seikatsu ni eikyo wa arimasu ka?
I see. Does it affect your daily life?
結衣 Yui

たまに文字が二重に見えることがあります。
Tama ni moji ga nijuu ni mieru koto ga arimasu.
Sometimes I see letters doubled.

Sources

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