This study is a prospective, randomized, double-blind cohort study aimed at assessing the accuracy of the preoperative tilted gaze target test in predicting the degree of improvement in compensatory head position after surgery in children with superior oblique muscle palsy.

This is a prospective, randomized, double-blind cohort study conducted from May 2023 to April 2024. The study aims to evaluate the effectiveness of a non-human contact gaze tilt test in the diagnosis of children with superior oblique Muscle Palsy. Patients who met the inclusion criteria for outpatient and inpatient ophthalmic surgery for strabismus and pediatric ophthalmology were enrolled after signing a written informed consent. The gaze tilt test was added to the normal treatment process and performed by a professional ophthalmologist who was not involved in the treatment process. The test involved playing a small animated video with a visual mobile device at a distance of 33 cm and 3 m, respectively, to determine the optimal angle of head position improvement and the spatial tilt angle of the screen relative to the orthostatic position. A third-party analysis of the data was performed to identify myotonic and oculocutaneous tilts and compared with the results of the conventional test. The study aims to clarify the authenticity, reliability, and practicality of the gaze object tilt test in diagnosing and treating oculocutaneous squint.

Inclusion Criteria:

• Age between 1 and 8 years old.
• History of torticollis less than 5 years.
• Ability to cooperate with basic examinations at the Tianjin Ophthalmology Strabismus and Pediatric Ophthalmology Clinic.
• Complete clinical information available.
• Signed informed consent.

Exclusion Criteria:

• Both eyes cannot look at the same time or alternately
• Children with ocular disease other than oculomotor eye disease.
• Clearly defined systemic developmental abnormalities: Down syndrome, microcephaly, autism, Leber syndrome, central visual impairment, etc.
• Children who cannot cooperate with the examination due to age or other reasons.

During the procedure, the participants will not be informed of the results of the gaze tilt test. The tilted gaze target test will be conducted by a professional ophthalmologist who is not involved in the consultation and is unaware of the actual diagnosis of the study participants. The investigators will ensure that the normal consultation process is followed without being informed of the results of the gaze tilt test. The statistical analysis will be performed by a third-party outcomes assessor.