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
If the PD of your basic prescription is 29.5/31.0, the PD for computer glasses would be 29.0/30.5 or 28.5/30.0. To convert a multi-focal prescription for single vision reading glasses, simply combine the Add number and the Spherical number.