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.
If we multiply the watt (the amount of electrical power) by the period of time it is used, we arrive at the amount of electricity consumed. The standard measure of electricity consumption is the amount of watts used over one hour, which is how we get the watt-hour (Wh). For example, if we go back to that 40 W light bulb: if itâs turned on for one hour, it will use 40 Wh of electricity.