Patients with ocular muscle weakness may be caused by myasthenia gravis, facial nerve palsy, and motor nerve palsy.
1. Myasthenia gravis: Myasthenia gravis patients have autoimmune system dysfunction, which produces antibodies against acetylcholine receptors, leading to the destruction of acetylcholine receptors in the postsynaptic membrane at the neuromuscular junction, preventing the binding of acetylcholine and the receptors, and thus the manifestation of myasthenia gravis can occur. If the extraocular muscles are involved, the patient may have the symptom of eye muscle weakness.
2. Facial nerve palsy: Facial nerve has branches to innervate the orbicularis oculi muscle, which is one of the facial expression muscles around the orbit and eyelids. When peripheral facial nerve palsy leads to orbicularis oculi dysfunction, it leads to ocular muscle weakness, and the patient may have symptoms such as incomplete eyelid closure and difficulty in opening the eyes.
3. Actinic nerve palsy: Brain stem hemorrhage, posterior circulation infarction, intracranial aneurysm, inflammation and other factors lead to actinic nerve dysfunction, its innervating muscles such as upper rectus, lower rectus, lower trapezius, levator palpebrae and pupillary sphincter dysfunction, the patient may also appear in ophthalmoplegia.
It is recommended that patients with ophthalmoplegia should consult a doctor in time to evaluate their condition and follow the doctor’s instructions for treatment.