Rashi on Isaiah
To open blind eyes who do not see My might, to take heart to return to Me.
Ibn Ezra on Isaiah
To bring out the prisoners, etc. To tell Israel that they shall be delivered out of the Babylonian exile. Comp. 49:9
Rashi on Isaiah
to bring prisoners out of a dungeon And because their eyes will be opened, the prisoners will come out of the dungeon. Another explanation: To inform them of the exile destined to befall them, out of which they will eventually come.