Eyeglasses should fit comfortably, securely and it shouldn't slip off of your face. You should not feel discomfort after wearing your glasses.

D, or Pupillary Distance, is the measurement between the centers of your pupils, typically in millimeters. It's an important measurement when buying eyeglasses online because it ensures that the optical center of the lenses aligns correctly with your eyes, which helps prevent eye strain, blurriness, or discomfort. When ordering glasses online, many retailers will ask for your PD to make sure the lenses are properly aligned with your vision. If you don’t know your PD, you can often measure it yourself with a ruler and a mirror, or you can ask your optometrist for the measurement from your last eye exam.

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