Meaning of “Recovering of Sight to the Blind” Inserted in Luke 4:18, but Not in Isaiah 61:1?

Question: Luke 4:18. What lesson is to be learned from the insertion of “recovering of sight to the blind” in Luke 4:18 though absent from Isa. 61:1? E.N.
Answer: It would seem that the Seventy, who translated the O. T. into Greek, added here from elsewhere in the prophet Isaiah, another beneficent fruit of Messiah’s presence and power, the bestowal of sight on the blind. Dean Alford in his note to this text refers to Isa. 58:6. If this be correctly represented, it is hard to discover the link literally or spiritually. It may be more simply and fairly referred to Isa. 35:5, where the sense is the same, though the words differ. Luke cites here and elsewhere from the Septuagint. No other lesson seems intended.