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
In order to make prescription lenses we need your pupillary distance (PD). This is the distance in millimeters from one pupil to the other. Your glasses prescription may have this measurement marked down, if so please select I know my Pupillary Distance (PD) and enter the number. Otherwise, please select Pupillary Distance (PD) Self-Test and follow the instructions.