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Measurement accuracy can be affected by a disease such as cataracts

Measurement accuracy can also be affected by severe astigmatism

Scanning procedure is perceived by some as invasive

Not very user friendly

Subject being scanned must be close to the camera optics

High equipment cost

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Retinal scanners are typically used for authentication and identification purposes. Retinal scanning has been utilized by several government agencies including the FBI, CIA, and NASA. However, in recent years, retinal scanning has become more commercially popular. Retinal scanning has been used in prisons, for ATM identity verification and the prevention of welfare fraud.[6] Retinal scanning also has medical application.

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Once the scanner device captures a retinal image, specialized software compiles the unique features of the network of retinal blood vessels into a template. Retinal scan algorithms require a high-quality image and will not let a user enroll or verify until the system is able to capture an image of sufficient quality. The retina template generated is typically one of the smallest of any biometric technology.

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Retinal scan is a highly dependable technology because it is highly accurate and difficult to spoof, in terms of identification.  The technology, however, has notable disadvantages including difficult image acquisition and limited user applications.  Often enrollment in a retinal scan biometric system is lengthy due to requirement of multiple image capture, which can cause user discomfort.  However, once user is acclimated to the process, an enrolled person can be identified with a retinal scan process in seconds.

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A retinal scan is a biometric technique that uses the unique patterns on a person's retina blood vessels. It is not to be confused with another ocular-based technology, iris recognition, commonly called an "iris scanner."