Final answer:
A retinal prosthesis often receives its power from miniature batteries and less commonly may use radio frequencies or ultrasonic wave pulses for wireless power transmission.
Step-by-step explanation:
A retinal prosthesis, also known as a bionic eye, is a type of biomedical implant designed to provide a form of vision to people who have lost their sight due to retinal diseases. The device usually captures visual information through an external camera and processes this information to create a signal that can stimulate the remaining retinal cells to provide visual perception.
A retinal prosthesis receives its power typically from miniature batteries that are either implanted with the device or worn externally. Some advanced prototypes may also explore power transmission through radio frequencies or ultrasonic wave pulses, which are wireless methods, but these are less common compared to battery-powered solutions. Wires that pass through the body are used less often due to the potential for infection or discomfort.