But if you brought the lenses away from the top of the surface, you lost the image. They were not a practical way to find tiny early changes. |
Most of these early changes probably don't go anywhere. But we are looking for ways to differentiate between good apples and bad apples. |
You would sort out people at higher risk and lower risk, and then maybe don't have to examine those at low risk as much. You will have a natural (method) of sorting out people for prevention, rather than for treatment. |