<s>[INST] Blood pressure is 159/117; I have no medical issues, except I went blind for 40 minutes yesterday on what the hospital called a migraine aura transient biological blindness. I had no pain, nor do I know. The bottom one seems high, but the internet is not that helpful. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Regarding your concern, I would explain that your symptoms could be related to a migraine attack or a TIA (transient ischemic attack). For this reason, I recommend performing a brain MRI study and a Doppler ultrasound of the carotid arteries to investigate for possible narrowing. Hope I have answered your query. Let me know if I can assist you further. </s>