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
Non-prescription lenses for reading are simply magnifying glasses mounted in frames. They are not usually up to the quality of those ground in a prescription laboratory, and the optical centers of the lenses are not likely to be in the precise position that gives you the best and most comfortable reading vision.