Seeing Du Heng so hurried, Professor Zhang skipped the pleasantries and got straight to the point. "It's like this: four days ago, a patient came to our hospital. Everything this patient sees is upside down."
"Upside down?" Du Heng interjected.
Professor Zhang nodded. "Exactly, upside down. Everything he sees is reversed, to the point where he experiences vertigo. He can fall even when standing with his eyes open, and now he's unable to take a single step."
Du Heng scratched his forehead but remained silent, waiting for Professor Zhang to continue.
As Professor Zhang spoke about this patient, he too wore a look of bewilderment. In his long career in ophthalmology, he had seen eyes that had burst and numerous cases of retinal detachment. He had even seen eyeballs that had popped out and been reinserted. But a patient who saw things upside down? This was a first.
