Your PD should be exact. If your lenses aren't centered correctly, they can cause discomfort and eye strain. A small margin of error might not cause problems, but it's better to be as accurate as possible.13 May 2020
What happens if the PD on my glasses is wrong?
Your Glasses If your pupil distance does not match where the centers of your pupils are, your vision can be affectedLike wearing someone else's glasses! The wrong PD can induce eye strain, fatigue, headaches and blurry vision.26 Dec 2017
Can PD be off by 2 mm?
If it's a low power,your fine . If it's a high power , you would want to tell the optician when you get your next pair of glasses. How off is the PD ? If it's off by 5 MM on a high power, have the optician make you glasses 2 MM off, you should be fine .