Following are a number of back-translations as well as a sample translation for translators of Isaiah 42:7:

• Kupsabiny: “You shall open the eyes of the blind.
  You shall release those who are tied/captured in darkness
  those people who are in prison.” (Source: Kupsabiny Back Translation)
• Newari: “So that [I] will cause those who do not see with their eyes, to see,
  [I will take] the imprisoned prisoners out of prison
  and I will take those who sit in dark places, out of the dungeon.” (Source: Newari Back Translation)
• Hiligaynon: “in-order to-open-the-eyes of the blind(s) and to set-free the captives, who were-imprisoned in the dark prison-cell.” (Source: Hiligaynon Back Translation)