Exist

The third minute I took off the gauze, I realized something was wrong with the world. "Qi Xiuyuan, how do you feel? Can you see clearly?" Dr. Lin's voice came from the right side. I blinked my sour eyes, adjusting to the long-lost light. The white ceiling, light blue curtains, and Dr. Lin's familiar face - these are all normal. What's abnormal is the translucent number floating above Dr. Lin's head: [63]. "I... I can see clearly." I replied hesitantly, but couldn't take my eyes away from the number. It was like some kind of holographic projection, shaking slightly as Dr. Lin turned his head, with a faint blue light glowing around the edges of the numbers. "Very good, the cornea is recovering well." Dr. Lin lowered his head and wrote something on the medical record. The number above his head suddenly jumped and turned into [62]. "We will observe him for another day. If there is no problem, he can be discharged from the hospital tomorrow." I opened my mouth, wanting to ask what that number was, but I didn't know where to start. Could this be the sequelae of eye injury? Some kind of optical illusion?