I have heard people talk about how LASIK dramatically changed the way they saw everything. They could see with greater focus and vividness, in a way they never imagined. Lasik harnesses the power of light in the form of a laser. It is heat that cuts into the retina to correct the vision. They have perfected it so that it is not painful. Isaiah experiences spiritual Lasik that changes the way that he views God and himself. And it is painful. He has come in contact with divine fire and the old way of looking at God and himself has melted away and the reality is unbearable for Isaiah.