1 John 1:5 says, "God is light, in Him there is no darkness." Separation from God means we reject the light and therefore are in darkness. Seeking God means we desire light and therefore are no longer blind. It's more of an eyes opened in acceptance of God and seeking Him as opposed to eyes closed in rejection to God and a desire to serve oneself that results in spiritual sight or blindness. If you spent your day with your eyes closed because the light hurt your eyes whenever you tried to open them you might as well be blind. Noone can see with their eyes glued shut...you're just blind. Accepting Christ means we look to Him, accept Him and allow the light of truth to shine in our hearts. This can only happen when our eyes are opened desiring truth and, as a result, we are no longer blind. Jesus is the only way.
"And they shall know the truth and the truth shall set them free."
"And when the Son sets you free, you shall be free indeed."
"I am the way, the Truth and the life, no man can come unto the Father but by me."