Abstract： Objective To designe an automated eye position trainer and to evaluate application in patients with pterygium.Methods A prospective case-control study.Patients with pterygium who underwent surgery in our hospital from December 2021 to January 2023 were collected and randomly divided into the experimental group(n=66)and control group(n=66).The patients in the control group received preoperative eye position fixation training in the traditional way,and the patients in the experimental group were trained with automatic eye position training instrument before operation.The intraoperative eye position,the number of cases of intraoperative ocular position deviation,the degree of surgical fit and the incidence of complications were compared between the two groups.Results There were no significant differences between the two groups in the number of times the eyes deviated from the illumination range of the microscope caused by head shaking,the times of adjusting the eye position during the operation,the times of adjusting the microscope during the operation,the times of mismatch of command steering and the times of deviation of the eye position during the operation(P>0.05).However,the times of spontaneous eye rotation and the time of operation in the experimental group were signifi-cantly lower than those in the control group(1.59±1.64)vs.(4.24±1.15)and(38.73±9.56)min vs.(71.29±17.75)min.The ac-tive eye position adjustment times(2.76±1.39)min vs.(1.76±1.28)min and the longest fixation time(2.09±0.67)min vs.(1.23±0.72)min in the experimental group were significantly higher than those in the control group(all P<0.05).There was no significant difference in the cure rate between the experimental group and the control group(all P>0.05),The incidence of conjunctival suture loosening was significantly lower in the experimental group than in the control group(P<0.05),but there were no statistically significant differences in the incidence of conjunctival tears and corneal abrasions(all P>0.05).Conclusions Preoperative automatic eye position fixation training instrument can reduce the operation time,complica-tions and recurrence rate of pterygium,and the automatic eye position training instrument has clinical application value.