We wrote in January about various biometric scanning systems and fingerprint scanners. At the time we also mentioned retina scanners as one of the systems with potential for wider use in the future.

But it seems that interest in developing retina scanners for the retail market is diminishing. There are two reasons for this: invasiveness and inefficiency.

Retina scanners work by shooting laser light at your eyeball to scan the blood vessels embedded deep within. The veins make a pattern that is as unique to each person as a fingerprint, so they