In the Bible, spiritual blindness means not being able to see the truth as revealed by the Holy Spirit of God. It is the devil’s desire for mankind to be blind to the truth, and to the work of the Spirit. How does this take place? It would help to look at a few examples.
People who have heard the gospel of salvation, that only Christ is the Savior, but refuses to believe are spiritually blind. Why? It’s because they cannot accept what is true according to God’s word, and they hold on to their traditional beliefs about the matter.
The Israelites, as a nation, are currently spiritually blind. That is because until now, they have not regarded Jesus as their Messiah, but a mere teacher who started the Christian religion. However, there will come a day, when this spiritual blindness will cease, and Israel would turn back to God.