וְהָיִ֖יתָ מְשֻׁגָּ֑ע מִמַּרְאֵ֥ה עֵינֶ֖יךָ אֲשֶׁ֥ר תִּרְאֶֽה׃
이러므로 네 눈에 보이는 일로 인하여 네가 미치리라
Ibn Ezra
Scripture now elaborates on the cause of the abovementioned “madness” [: 28]: the sight of your body covered with boils.
Haamek Davar
You will become insane. You will be amazed that you have become like this. That a few bandits have done so much damage, and your strength cannot save you, even though really it should have been strong enough against them. From this you will become insane and go out of your minds.