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
This number represents your PD in millimeters. 5 MEASURE YOUR PUPILLARY DISTANCE ZENNI Â® TIPS ËMeasure this paper against a ruler to assure printout is accurate. ËMost adults have a PD between 54 - 74mm. ËMost children have a PD between 43 - 54mm. ËTake a few measure-ments for consistency. WHATâS PD? The Pupillary Distance (PD) is the distance between the pupils of the eyes, center to center, in millimeters. A PD should be provided as part of your prescription. Read more about Pupillary Distance and how to read your prescription on our website by visiting: zennioptical.com/measuring-pd PD = 56 FOLD FOLD 0 10 20 30 40 50 60 70 80 5 15 25 35 45 55 65 75 USING A MIRROR 0 10 20 30 40 50 60 70 80 USING A FRIEND 5 15 25 35 45 55 65 75 LOOK IN A MIRROR OR FIND A FRIEND Stand 8 in. (20 cm.) away from a mirror or a friend. Place & hold the PD ruler against your brow. Keep your face straight. 3 (20 cm) 8 in MIRROR