Usage patterns
〈仮名遣い〉が乱れるone's kana usage becomes sloppy/inconsistent
It's said that young people's kana usage has become sloppy these days.
〈仮名遣い〉を直すto correct someone's kana usage
My teacher corrected the kana usage in my essay.
〈仮名遣い〉に従うto follow a particular kana orthography convention
This text is written following the modern kana orthography.