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
Single vision prescriptions work well in different lens materials: Glass â works well low prescriptions - 1.53 Index of Refraction - Heaviest of all lens materials (higher Rxâs can be quite heavy on the face) - Hardest of all material - Safety Issues â most eye doctors will not put into a childâs eyeglass frame