Table 1. Time points of intraocular pressure measurements and condition of the subjects.

Time points	Condition
P1: Day before RALP	Supine position, conscious
P2: 5 min after systemic anesthesia induction	Horizontal supine position, anesthetic
P3: 10 min after maintaining head-down positon	Head-down supine position, anesthetic, with insufflation of the abdomen with CO2.
P4: 1 h after maintaining head-down positon	Head-down supine position, anesthetic, with insufflation of the abdomen with CO2
P5: 2.5 h after maintaining head-down positon	Head-down supine position, anesthetic, with insufflation of the abdomen with CO2
P6: 4 h after maintaining head-down positon	Head-down supine position, anesthetic, with insufflation of the abdomen with CO2
P7: 10 min after release of head-down position	Horizontal supine position, anesthetic
P8: Day after RALP	Supine position, conscious

RALP: Robot-assisted laparoscopic radical prostatectomy.