Seeing how fingerprint technology is right now a big thing in many chain businesses for employees to log in and 'clock in' for work or internet it doesn't surprise me at all that they are seriously contemplating moving on to retinal scans as a mode of tracking.
Me and my dad were discussing something similar to this about a year ago, on how we can see within a decade's time them putting barcodes on everyone's hands or something(somewhere easy to see and scan) and all your credit card info, SS, etc is all tied into the barcode/microchip in you so you would have no need for cards, cash, ID, license, etc...because it would all be in that barcoded microchip in your hand..and the government would be able to monitor you everywhere you went (as now you can go about and pay cash for things and there isn't a digital trail like from a check or card) .... I know it sounds paranoid but to me it seem very feasible and shoot makes more sense IMO than retinal scans if they wanted to do something like that. *shrugs*