CRAO is considered a stroke of the eye. Studies show that about two-thirds of patients have underlying high blood pressure and one-fourth of patients will have significant carotid artery disease (plaque with narrowing of the artery lining), cardiac valvular disease or diabetes.
Electrical pressure is measured in volts, or voltage. All electrical devices are rated for specific voltages. Most devices and small appliances in a home are rated for 120 volts, while high-voltage appliances, such as electric dryers, ranges, and many baseboard heaters, are rated for 240 volts.
Measuring electricity. We can measure electricity in a number of different ways, but a few measurements are particularly important. Photo: You can use a digital multimeter like this to measure voltage, current, and resistance. Voltage. The voltage is a kind of electrical force that makes electricity move through a wire and we measure it in volts.