Patients who met the criteria and needed to undergo elective surgery via arterial and venous puncture were included in this center. They were randomly divided into three time periods (8:00-9:00, 12:00-13:00, 16:00-17:00) and were exposed to green light (experimental group) and transparent light (control group) respectively. The effects of green light exposure on acute perioperative pain in patients were observed at different times.
Age range: 18 - 50 years old.
ASA classification: I - III.
Planned to undergo abdominal surgeries requiring general anesthesia and arterial puncture (this is not necessary for the healthy volunteer group).
Obtained informed consent from the patients.
Skin ulceration, allergic reactions, or dermatitis at the tested area.
Long-term use of analgesics or psychiatric medications.
History of color blindness or uncorrected cataracts.
Severe cardiovascular or respiratory diseases, inflammatory disorders, etc.