With some familiarity in the data center security space, I can tell you that reliable Retina scanners are not cheap. A real PITA if someone has diabetes, cataracts, or even severe astigmatisms. I’ve seen times in the past where we’ve had to remove it from the authentication process. Not a big deal for us because it is typically one of multiple factors used in authentication, but for you, you want to make sure you have multiple unlock paths!
I would agree with the previous poster, check out a mobile phone biometric enabled unlock. Similar cool factor without the hassle!
Hey, I was restraining myself, but he posted a video so I can post a cartoon… (already given my serious reading - that the scanner is not really necessary and has a downside).
Still geeky but without the added complexity of retina scanning. Obviously you can chop and change aspects and fail safes, which would make it cheaper.