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
Knowing your PD. Usually, the PD is measured during your eye test.. If your PD is not included in your glasses prescription, call your doctor to get the PD as it is saved with him/her. The second option is to measure it easily by yourself! Stand straight in front of a mirror and place a simple ruler (which has measurements in mm) on your nose.