Well, yes, high blood pressure can just cause blindness finally, so it can be very dangerous to have it. Generally speaking, high blood pressure is known as Hypertension, and it is called “the silent killer." According to some experts, when you have high blood pressure, it will just affect your body, leading to some problems. And it can also affect your eyes, finally blindness can be possible. In detail, if you have diabetes, high blood pressure can cause the tiny capillaries in the retina of your eye to bleed. This condition, called retinopathy, can lead to blindness. By the way, if left untreated, high blood pressure greatly increases your risk for heart attack and stroke. So just be careful about it.