Hypertension or high blood pressure can lead to eye damage and diseases of the eyes which can eventually cause flashing lights to occur in your eyes so if you're experiencing flashing lights in your eyes see an eye doctor about it before it gets worse and causes blindness.
Flashing lights in eyes can also be caused by Retina Detachment or you could be at risk for a Retina Detachment so you should see your eye doctor to see what's really going on.
Normal blood pressure should be around 120 over 80 and anything higher it could be leading hypertension.
Other signs and symptoms of high blood pressure and hypertension are headaches and dizziness, Facial flushing, nosebleeds, nausea and heart palpitations.
If your blood pressure is high you can usually lower the blood pressure by drinking some water or some water with a tablespoon of Apple Cider Vinegar.
You can also lower blood pressure by taking a tablespoon of Apple Cider Vinegar without the water if you want too.
If you cannot get the blood pressure lowered at home you should seek medical attention because high blood pressure can cause heart disease, strokes, heart attacks and even death.