It helps to know how blind you are so when your eyes are opened you know immediately what to do.

And behold, there were two blind men sitting by the roadside, and when they heard that Jesus was passing by, they cried out, “Lord, have mercy on us, Son of David!”

The crowd rebuked them, telling them to be silent, but they cried out all the more, “Lord, have mercy on us, Son of David!”
And stopping, Jesus called them and said, “What do you want me to do for you?”

Jón Gauti Jónsson
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They said to him, “Lord, let our eyes be opened.”

And Jesus in pity touched their eyes, and immediately they recovered their sight and followed him.

Matthew 20:29-34 (English Standard Version)Bible Gateway link