What physical characteristic does a retinal scan biometric device measure?

Question

Options

• AThe amount of light reflected by the retina
• BThe size, curvature, and shape of the retina
• CThe pattern of blood vessels at the back of the eye
• DThe pattern of light receptors at the back of the eye

• A
  3% (1)
• B
  5% (2)
• C
  89% (33)
• D
  3% (1)

Explanation

A retinal scan is a biometric technique that uses unique patterns on a person's retina blood vessels to identify them. The retina is a thin layer of tissue at the back of the eye that contains millions of light- sensitive cells and blood vessels. The retina converts the light rays that enter the eye into electrical signals that are sent to the brain for visual processing78 The pattern of blood vessels in the retina is not genetically determined and varies from person to person, even among identical twins. The retina also remains unchanged from birth until death, unless affected by some diseases or injuries. Therefore, the retina is considered to be one of the most accurate and reliable biometrics, apart from DNA78 A retinal scan is performed by projecting a low-energy infrared beam of light into a person's eye as they look through the scanner's eyepiece. The beam traces a standardized path on the retina, and the amount of light reflected by the blood vessels is measured. The pattern of variations in the reflection is digitized and stored in a database for comparison

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