We mostly see with the mind, and the mind is flexible. For the four hundred million people with amblyopia (lazy eye), their brain encountered an installation error when linking both eyes as babies. As a "Plan B", their brain switched one eye off. I'll talk a bit about how the visual system works, and how our open-source virtual reality software (backed by social impact lab Leipzig and the prototypefund.de) can hack through that suppression and provide a chance to "re-install" full sight with two eyes.