There are several possible causes of ocular inflexibility: 1. Ocular trauma. Ocular trauma can lead to fractures of the orbital wall and embedded extraocular muscles, which can lead to ocular dyskinesia. 2. Orbital tumors. When orbital tumors grow large, they can compress the extraocular muscles and lead to extraocular muscle dysfunction, which can cause inflexible eye movements. 3. Extraocular muscle palsy. Extraocular muscle palsy can lead to restriction of extraocular muscle function and cause eye movement disorders. 4. Thyroid-related eye disease. When the thyroid gland is hyperactive, it can cause hypertrophy and dysfunction of the extraocular muscles, resulting in ocular dyskinesia. 5. Severe dry eye. Severe dry eye can lead to dry eyes and limited movement.