Here "blindness" is a metaphor for not knowing God's truth. Alternate translation: "If you wanted to know God's truth, you would be able to receive your sight. (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "seeing" is a metaphor for knowing God's truth. Alternate translation: "Since you falsely think that you already know God's truth, you will remain blind" (See: [[rc://en/ta/man/translate/figs-metaphor]])