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
When you enter your Pupillary Distance (PD) details on the Stingy Specs glasses prescription form, enter the number you have just measured â this is your âdistance PD.â You then need to enter your ânear PDâ which is calculated as 3mm less than the distance PD.