The blindness we have is the ego's heavy veil infront of the truth. How did it get there? We put it there. When we eat from a tree that has bad fruit, the results are simply bad. Pretty simple, right? The good news is we can do nothing to change the truth, it has remained the same. The light was always shining~the veil is lifted!
1 John 2:7
8 Yet I am writing you a new commandment, which is true (is realized) in Him and in you, because the darkness (moral blindness) is clearing away and the true Light (the revelation of God in Christ) is already shining.