Oliver Sacks’ most recent book ‘The Mind’s Eye’ looks at the curious relationship between your brain and your eyes.

He follows the patient Sue, who was born stereo-blind (that is, without binocular vision which is necessary to construct a sense of depth). Born cross-eyed she had surgery at ages 2 and 7 buy was told there were no corrective exercises that would be done to help her gain a 3D vision of the world. In her 40’s, with the help of a developmental optometrist,  she decided to try corrective exercises anyway and realised her 3D vision was able to be activated, suddenly seeing the steering wheel and doors “popping out” into the world once the binocular cells in her brain were activated to see the world this way. Without exercises however, this ability faded and she lost her 3D vision, demonstrating the incredible elasticity of the brain’s capacities.

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