Which method does retinal scanning use to identify a person?

Retinal scanning is a biometric identification method that analyzes the unique pattern of blood vessels located at the back of the eye, specifically in the retina. Each person's retinal patterns are distinct, much like fingerprints, making this method highly accurate for identifying individuals. During a retinal scan, a beam of low-intensity infrared light is directed into the eye, which captures the unique pattern of the retinal blood vessels. This pattern is then converted into a digital template, which can be compared against stored patterns for identification purposes.

The other methods mentioned, such as voice recognition, fingerprint analysis, and facial recognition, rely on different biological characteristics or patterns and do not utilize the retinal patterns of blood vessels, which is the key distinguishing feature of retinal scanning.