Sometimes when someone has been blind, most of their life, they grow to the point that they prefer to be blind. They have been blind for so long that they have grown accustomed to being blind. They have adjusted their life to so they will be able to live without sight. This is a tough and 'wise' thing to do. But, this can easily turn to foolishness.
One day comes along and the blind person becomes able to see. (caused by an event or person) Even though they are able to see, they still act blind. They may even, intentionally, keep their eyes closed to keep the effect of being blind. Being able to see, to them, is more of a disabling factor instead of a new ability. To them, instead of knowing more about the world, a limited understanding has become satisfactory. This activates the phrase 'Ignorance is bliss.'
When God is trying to open your eyes, do you still act blind? Maybe you have been in darkness long enough. Now, He is saying, 'Let there be light.' Unlearn.
I will bring the blind by a way they did not know; I will lead them in paths they have not known. I will make darkness light before them, And crooked places straight. These things I will do for them, And not forsake them.