Following are a number of back-translations as well as a sample translation for translators of Isaiah 44:18:

• Kupsabiny: “The people who do like that are stupid,
  and they know nothing.
  Their eyes are blind and they do not see.
  the heads of those people are weak
  so that they do not understand.” (Source: Kupsabiny Back Translation)
• Newari: “Men like that are certainly fools, they just do not understand!
  Their eyes have been closed and they do not see anything.
  Their minds have also been closed, and they do not understand anything.” (Source: Newari Back Translation)
• Hiligaynon: “These people do not know or understand what they are-doing. Their eyes are-covered and they can- not -see. Their minds are closed/[lit. covered], and they can- not -understand.” (Source: Hiligaynon Back Translation)