I am sorry to hear about your son’s medical problems. If the shaky vision was followed by a headache then yes, it can be an aura of migraine. Other causes could be poor eye sight, low or high blood pressure, severe anemia, low blood sugar, temporal arteritis, hyperthyroidism, ear problems, cervical nerve compression, anxiety and panic attack or benign intracranial hypertension. This needs a comprehensive investigation. Please discuss with his doctor as soon as you can. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.