The Iris scanner is another form of biometric (biology measurement) system.  

It scans the unique patterns in the eye and compares this with a user pre-learnt into the database.  More suited to commercial / high security applications the iris scan has a small presence in domestic access systems. 

One of the hidden qualities / issues with some iris scanners is that they can measure blood pressure and heart rate (to ensure the eye being scanned is still attached to the owner!) for this reason they can record information about the healh of the people being scanned. 

In a proactive environment this data could be shared with the users to the benefit of all, in a draconian environment, HR decisions could be based around this information also. Big brother is watching you...

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