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Thomas keith


Does pupillary distance have to be exact?

Is it very important to get exact pupillary distance for buying eyeglasses? And what will happen if i wear glasses with incorrect pupillary distance?
Related Topics : PD glasses
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Answers (8)

  • Alex Smith


    My Pupillary distance is right eye 31.5mm and left eye is 30.5 from Specsaver. My prescription is Right eye: Spere -4.25, Cyl: -1.25; Axis: 165 and Left eye: Sphere -4.50; Cyl: -1.00; Axis:10. But my online glasses maker can only make single pd of 62mm. That is left eye 31mm and right eye is also 31mm. so there is a difference of 0.5mm pd difference each eye. will this harm my eye? I have premature wrinkle due to my broken glasses arm which tilted the lens and lens I'm tired and cause me to have sign of premature forehead wrinkle now I have read this could be dure to wrong prescription and hence cause muscle around eyes work too harm. in my cse could be due to my broken glasses frame arm and hence lens not positioned correctly.. so I concern this 0.5mm pd difference will this cause me tried muscle around eye again can cause permanent and more premature wrinkle? And also harm my eyes?
  • leigh sehr


    Actually, the pupillary distance measurement does not have to be 100% precise to be useful, as it can tolerate a fairly small error range. A pd difference of 1mm is not going to cause trouble, in real terms 1mm is a variance of .5mm to each eye, and would not be noticable. if you wear glasses with incorrect pupillary distance, you will occur headaches, eye strain and dizziness. So 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.
  • David


    what is the acceptable variance for a PD measurement? How close to accurate should it be?
  • cook


    Pupillary distance is a must when you buy eyeglasses at online shop or at any mortar-and-brick store. An incorrect PD won't harm the eyes but may cause discomfort or strain which would be noticeable upon wearing the glasses. Moreover, you also will get headaches! Even a 2mm difference in pupillary distance can cause a pair of eyeglasses to feel off because your pupils tend to converge or diverge to the center of the lens. Moreover, pupillary distance is more crucial the higher the power of your prescription.
  • Victor Lee


    Well, generally speaking, an incorrect PD will not harm your vision, but on the other hand, it will just make you feel not comfortable, at this moment, you should stop wearing the glasses. According to some experts, wrong Pd will not damage your vision but it may cause uncomfortable vision this will especially be the case if you have a high prescription. And in some case, you may get eye strain because of it and also, prismatic effects may occur with the wrong PD, depending on your prescription. So just go and see the eye doctor, when some symptoms occur.
  • Jordan


    It is very important to get exact pupillary distance in the preparation for making prescription glasses, for it positions lenses correctly in relation to the center of the pupils. Besides, it is especially important in making higher powered lenses because of the location of the optical center of the lenses. The effect of incorrect pupillary depends on the power of the lenses. If your lenses are of low power, small error will not cause uncomfortable feeling while big one such as 10mm will lead to vision distortion and headache. If your lenses are of higher power, you should pay particular attention to the pupillary distance.
  • miguel gaytan


    Yes, it can't be more important when buying eyeglasses. Glasses of the wrong size will not feel comfortable to wear, and can cause vision problems. The least con would be that the vision of the patient can't be corrected appropriately. Worse still, the patients can also develop headaches and eye strain because their eyes have trouble focusing through the lenses. You may suffer from double vision, headache, astigmatism, dispersion, strabismus or even the change of the positions of your eyes. Thus, it's crucial to get exact pupil distance when having prescription.
  • classynottrashy


    Pupillary distance refers to the distance between the two central of the pupilla of your eyes when you are looking squarely or of parrallel. The purpose to measure the pupillary distance is to make the distance of the optical centrer of the glasses conform to your pupillary distance, thus making sure that your eyes can see through the optical center as usual. Therefore, it is decisive to measure your pupillary distance to choose the right glasses bracket. To wear a pair of glasses with the correct pupillary distance can make you comfortable and see things clearly. To the contrary, if you are wearing glasses with incorrect pupillary distance, there will be a prism effect when you see through the glasses, and you will feel symptoms of vision fatigue, dizzy, and nausea. If you wear this pair of glasses from time to time, it will certainly do harm to your eye sight. Please go to the eyeglasses shop to correct the pupillary distance of your glasses as soon as possible.