"It is hard to imagine the dramatic nature of the sudden epiphany that stereoblind people have if they gain stereopsis, as when Barry saw the steering wheel floating before her. Stereoblind people perceive the world in two dimensions, as a flat display; they judge distance and depth by such cues as size, shading, and the partial obscuring of one object by another. They have to develop these techniques in childhood because they suppress the information coming from one of their eyes, since the data from both eyes fail to match. Nothing in the experience of the stereoblind can prepare them for what stereoscopic vision is like. If they get it, the experience can be overwhelming; it can even cause vertigo, as happened to Barry, and sensations of travel-sickness."

"It is a pleasant and optimistic thought indeed, that at any point in life we might, if determined enough, be able to fix things, improve, mend, and grow in positive ways: even to see more clearly, and not just with our eyes."