Your Glasses If your pupil distance does not match where the centers of your pupils are, your vision can be affected– Like wearing someone else's glasses! The wrong PD can induce eye strain, fatigue, headaches and blurry vision.2017-12-26
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. However, you were not aware of the original 2mm error. A corneal reflection pupillometer is worth the investment.
Does pupillary distance really matter?
Pupillary distance is extremely important when fitting any kind of glasses – including single vision glasses. ... Glasses lenses are designed that way for maximum effect. If the measurement is not correct, this optical centre will still be at the centre of the lens, but it won't align with your pupil.2018-05-20
How important is accurate PD?
You need an accurate PD to ensure the correct placement of the lenses on your frames. It centers your prescription in front of your pupils, for the clearest and most accurate vision with your new glasses. Inaccurate PD can cause unnecessary eye strain and headaches.2021-10-25
Does your PD have to be exact?
The pupillary distance measurement does not have to be 100% precise to be useful, as it can tolerate a fairly small error range. If you do measure your own pupillary distance, it is recommended that you try several attempts to be sure you get a fairly accurate measurement.
How much can PD be off?
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.2018-10-23
Does PD number matter?
Pupillary distance is extremely important when fitting any kind of glasses – including single vision glasses. ... Glasses lenses are designed that way for maximum effect. If the measurement is not correct, this optical centre will still be at the centre of the lens, but it won't align with your pupil.2018-05-20