[krackers]

Yup. If you spend time all day at a computer but never wear glasses, I can magically guess that your prescription is around -2. That's not a coincidence, just calculate the focal length and it comes out to exactly the computer screen distance.

And when you wear your full prescription without correcting for target distance, you just restart the process all over again. For some lucky people the axial length seems to be fixed after some point, but for most people that sets them on the path of increasing power.