In my practice, some patients will complain that they “just don’t feel right”. If you have a high prescription and the wrong PD these symptoms are often much worse. The wrong PD can induce eye strain, fatigue, headaches and blurry vision. 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! This measurement is absolutely necessary to achieve precise vision. When you get glasses made, the pupil distance measurement is taken to ensure that the lens center is in line with your pupil center. The images we see focus through the pupil center onto this bulls-eye. You can think of the focusing of what you see like a target with a bull’s-eye in the middle. If you think about the structure of the eye, the pupils are in the center to direct light onto the center of the retina. At night, our pupils dilate to let more light in so we can see well.
They appear as black circles in the center of the colored part of our eyes, called the iris, and it is actually a muscle that opens (dilates) and closes (constricts) to let more or less light into our eyes. The pupils are in the center of our eyes. Why do you need this number to order glasses? Truth is, without this number, your glasses will not fit you correctly and you will likely experience blurry vision and headaches. If you’ve ever ordered glasses online, you are probably even more familiar with this “PD measurement”, and may have even attempted to measure it yourself at some point. TL DR - I think my actual PD is 66mm but I just ordered a $200 pair of glasses based on an erroneous PD of 65mm.If you have ever purchased eyeglasses you have probably heard of the measurement of the eyes called the pupillary distance (PD). It is unlikely my PD got smaller so I think the 66mm assessment was the more accurate one. It also indicated that I had a PD of 66mm. I told her I trusted her and went ahead with the 65mm measurement.Ī week later (when I was organizing various documents), I noticed an older prescription I had from when I was younger. When I went to the brick-and-mortar optician, however, the lady told me my pupillary distance was 65mm. The optometrist (for a fee) gave me my pupillary distance (66mm). I also intended to purchase glasses in the traditional manner (i.e., from a brick and mortar store) so as to compare whether my glasses obtained online would be similar to my glasses obtained traditionally. I recently went to an optometrist and requested specifically my pupilary distance so that I might purchase a set of glasses online.
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