During the day, your PD can vary about 3-4 mm depending on your viewing distance. For instance, if your PD is 61 mm when looking at distant objects (i.e. street signs, chalkboard, TV, etc.), it narrows to 57-58 mm when viewing objects within 16-24 inches from your eyes.Oct 23, 2018
What if PD is off by 2mm?
If the PD measured was 2mm off initially, by using a millimeter rule, the net cumulative error might be 4.5mm or more.
Is it okay if my PD is off?
If your PD is off, the “optical center” of your lenses will be, too, and your glasses won't be as effective as they should be. You also need your prescription. Lots of optometrists will give you a copy of your prescription but not include your PD.Mar 21, 2017
What if pupillary distance is off by 1 mm?
What if PD Is Off by 1mm? When the PD is wrong by a millimeter the outcome for the wearer will be very different depending on the lens power in the glasses. A wrong pupillary distance is measured in millimeters. This distance multiplied with the lens power equals the deviation a wrong PD produces.
How much can your PD be off?
The higher the prescription numbers, the more important it is. If off by too much, it can cause you some distortion. If you measured yourself, it is probably ok. Most people can tolerate a difference of 2mm or so in PD.
What happens if you use the wrong PD?
The wrong PD can induce eye strain, fatigue, headaches and blurry vision. If you have a high prescription and the wrong PD these symptoms are often much worse. In my practice, some patients will complain that they “just don't feel right”.Dec 26, 2017