A retina scan is a biometric technology that captures the unique patterns of blood vessels in the back of the eye, known as the retina. This method uses a low-intensity light source to illuminate the retina, allowing a camera to take a detailed image. The resulting scan can be used for identification and security purposes, as each person's retina is distinct. Retina scans are often employed in high-security environments, such as government buildings and data centers, to verify a person's identity. This technology is considered highly accurate and difficult to forge, making it a reliable option for access control and personal identification.