Intraocular pressure is the pressure of the contents of the eye acting on the wall of the eye. The interpretation of the IOP checklist is divided into the following three aspects: 1. Judgment of the right and left eyes: the right eye is indicated by the letter R and the left eye by the letter L. 2. The IOP value of a normal person is between 10-21 mmHg, with the difference between the left and right eye less than 5 mmHg; the 24-hour IOP fluctuation is less than 8 mmHg.