How to say “These lenses came back to the workshop because the optical technician spotted a mistake in their shape.” in Japanese
In Japanese
このレンズ、眼鏡加工技術者が形が合ってないのに気づいて、加工場に戻ってきたんだ。
Kono renzu, megane kakō gijutsusha ga katachi ga attenai no ni kizuite, kakōba ni modotte kita n da.