PD Measurement provides Far PD.
Far PD is the standard measurement used in the manufacture of eyewear. This measure is essential to ensure correct lens fit and clear vision at a distance.
The terms Far PD and Distance PD are commonly used interchangeably and are identical.
What do Far PD/Distance PD & Near PD mean?
When we talk about PD (Pupillary Distance), we need to distinguish between:
- Far PD/Distance PD: it is used for single vision eyeglasses and refers to the distance between the centers of the pupils, when the user is looking at a distance. This measure is often used for most prescription eyeglasses for example.
- Near PD: it is used for reading eyeglasses and refers to the same measurement but when the user is looking up close, such as when reading a book.
For most people, the difference between Far PD/Distance PD and Near PD is about 2-3mm.