The cause of ocular muscle weakness, this problem has a wide range. Eye muscles include many muscles. There are three kinds of muscles in the eyes, the muscles above the eyelids, the muscles outside the eyeball and the muscles inside the eyeball. Details are as follows: 1. If it is eyelid muscle problem, it will cause eyelid drooping or eyes can not be closed normally, which belongs to eyelid muscle problem. The symptom is ptosis, that is, there is something wrong with the muscles that lift the eyelids; 2. If there is a problem with the orbicularis oculi muscle, it can cause the eyes to close; 3. The muscles outside the eyes control eye movements. If there is something wrong with this muscle, it will cause strabismus and diplopia, that is, the position of the two eyes is asymmetric, or treating an object as two is called diplopia; 4. If it is a muscle in the eyeball, this muscle is used to control the size of the pupil in the eye, or it needs to be focused when looking far and near. This muscle plays the above role and is called ciliary muscle or pupil sphincter. If something goes wrong with this muscle, it will produce corresponding lesions. If there is something wrong with the sphincter of the pupil, you will be afraid of light. If there is something wrong with the ciliary muscles, you may not be able to see the near objects clearly.