Blind without knowing

Story in the video:
A friend told me that when he was in elementary school, he would always sit on the front row of class because he couldn’t see what the teacher was writing on the blackboard. He didn’t realize that he needed glasses. In fact, he didn’t realize it for many years later. How could anyone not know that they need glasses. You would think that if you could see well, then you would need glasses. Come to find out, he thought his eyesight was normal. How could anyone not know that they needed glasses?

From the Bible:
And they came to Bethsaida. And some people brought a man who was blind to Jesus and begged Him to touch him. Taking the man who was blind by the hand, He brought him out of the village; and after spitting in his eyes and laying His hands on him, He asked him, “Do you see anything?” And he looked up and said, “I see people, for I see them like trees, walking around.” Then again He laid His hands on his eyes; and he looked intently and was restored, and began to see everything clearly. And He sent him to his home, saying, “Do not even enter the village.”
Mark 8:22-26