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One side of a card might read, “Show me, sir, the lesions of Horner’s syndrome & oculomotor nerve paralysis. And what the divvil’s an Argyll Robertson pupil?”

The nerve that controlled the eyelid, called the oculomotor nerve, was the third in this column.

The experience felt as real as life, and my oculomotor system probably opined the same.

I thought you might enjoy taking the tour with me, to see one way that neuroscientists study oculomotor function.

The study, led by University College London and the University of Oxford, is understood to be the first time an oculomotor prosthesis - an implant that controls eye movement - has been used successfully.