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
Frame width is usually the most important factor in finding a pair of glasses that fit well. As a rule of thumb your eyes should be nearly centered in the width of the lenses. A frame that is too wide will make your eyes look close set while a frame that is too narrow will exaggerate the width of your face. Narrow. If you have a narrow face, look for frames in the 42mm to 50mm range.