Trochlear nerve examination

The method in which the trochlear nerve dominates the superior oblique muscle of the eyeball and examines whether the trochlear nerve is damaged by the downward and abduction movement of the eyeball is called a trochlear nerve examination. During the examination, the patient is seated. The examiner stands in front of him and fixes his head with one hand. The head is not rotated with the eye. The other hand extends a finger at 1 m in front of the eye for left upper, lower left, upper right, lower right, etc. Both eyes follow this finger movement, but the head does not move. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Choose a quiet environment before checking, do not stay up late for the night before. Normal value The direction of rotation of the eyeballs coincides with the direction of the finger movement of the examiner. Clinical significance Abnormal results The downward movement of the eyeball and the abduction movement weakened, suggesting that the pulley nerve was damaged. The person in need of examination is suspected of having a nerve damage in the trochlear. Precautions Forbidden before inspection: Choose a quiet environment before checking, and do not stay up late for the night before. Requirements for inspection: 1. Both eyes follow this finger movement, but the head does not move. 2. The examiner's finger movement should start from the middle position (the position of the two eyes when looking at the front is the middle position), instead of connecting the six movements to draw a circle. Inspection process During the examination, the patient is seated. The examiner stands in front of him and fixes his head with one hand. The head is not rotated with the eye. The other hand extends a finger at 1 m in front of the eye for left upper, lower left, upper right, lower right, etc. Both eyes follow this finger movement, but the head does not move. The examiner's finger movement should start from the middle position (the position of the two eyes when looking at the front side is the middle position), instead of connecting the six movements to draw a circle. Not suitable for the crowd Inappropriate crowd: Patients with eye pain or an eyeball that does not rotate properly.