But new Johns Hopkins research in mice suggests that neural stem cells, the bodyâs source of new brain cells, are resistant to radiation, and can be roused from a hibernation-like state to reproduce and generate new cells able to migrate, replace injured cells and potentially restore lost function.
Pupillary Distance (PD) You'll need to know your PD if you want to order glasses from EyeBuyDirect. Don't worry if your glasses prescription doesn't include your PD, we can show you how to measure it by yourself. How to measure your pd
Two PD values. A lower one for reading, a higher one for distance. Now if you remember moving the lenses in front of your eyes, and the index finger pupil experiment, and how your glasses are intended (and measured) for distance vision, it should all come together for you.