The eye position examination methods usually used in clinical practice include the masking method, single-vision mark examination method, corneal reflection method, and double-vision mark examination method, with differences in the specific processes. 1. Masking method: cover one eye, gaze at the forward visual marker with the contralateral eye without moving, move the eye mask to the contralateral eye and observe the direction of movement of the original covered eye. If the eye moves from outward to inward, it indicates that the subject may be suffering from esotropia, if it moves from inward to outward, it indicates that the subject may be suffering from esotropia. 2. Monocular examination: Both eyes observe a visual target at the same time, causing the patient to have diplopia, and judging the position of the eyes according to the positional change of the diplopia image. 3. Corneal Reflectance Method: A lamp is placed directly in front of the patient, flush with the patient’s eyeball and located on the patient’s median plane. Observe the reflection point on the patient’s cornea. The light reflection point in the gaze eye is located in the center of the pupil, and the light reflection point in the cornea of the strabismus eye is located in the non-central part. 4. Double vision standard examination method: the right eye should wear a red lens at the beginning of the examination, the examiner should use a projector to project a red light bar upward, let the patient use their own projector to project a green light bar onto the screen, and ask the patient to subjectively overlap the two lights, record the relative position of the two colored light bars, in order to repeat the examination for each diagnostic eye position. The examination was repeated again by switching the red and green glasses to the left and right eyes to obtain the eye position when both eyes were gazing separately. Eye position examination diagnoses an ocular abnormality and prompt medical attention should be sought.