This convergence changes the position of your eyes within the frame of your glasses, meaning the optical center needs to shift slightly inward compared to the distance PD measurement. If you are purchasing glasses online or considering a second pair of readers, knowing how to measure near PD yourself can be incredibly useful.
Why Near PD Matters For Computer
Typically, you'll need a helper to mark the positions of your pupils on a piece of paper or a mirror while you focus on a book held at your normal reading distance. When you look at your eyeglass prescription, the shorthand terminology can seem like a code designed to confuse.
When you look at something close, your pupils move closer together to maintain binocular vision and depth perception. Defining Near PD So, what does near PD mean on eye prescription? Near PD refers to the measurement of the distance between your pupils when you are focusing on a close-up object.
Why Near PD Matters For Computer
If you were to use your distance PD for a pair of reading glasses, the optical centers would be slightly off, forcing your eyes to look through a less-than-ideal part of the lens. The Science Behind the Shift The shift occurs because of a natural visual process.
More About What does near pd mean on eye prescription
Looking at What does near pd mean on eye prescription from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on What does near pd mean on eye prescription can make the topic easier to follow by connecting earlier points with a few simple takeaways.
