The scanner will secretly know which pupils get free meals and who has to pay.
Eleven-year-old Laura tested it and told CBBC Newsround's website:
"It's really good - you won't get bullied because people won't know who gets free meals."
And Jennifer, 12, said: "It's not at all scary, it's like looking into a mirror.
"It's a lot faster that using money so you can sit down quicker with your friends at lunchtime," she added.
The iris in your eye is as unique as your fingerprints which is why it's a good way to identify people.
You look into a camera for a few seconds while a video image is taken and then checked with the school database of pupil records.
And it's all perfectly safe.
Kids will also be scanned in the library when they want to take out books.