Your pupillary distance, or pd, is the distance in millimeters (mm) between the center of one pupil to the center of the other. A personalized fit starts with measuring your pupillary distance: It indicates which part of the lens you look through, ensuring optimal comfort and clarity. Pupillary distance, or pd, refers to the distance in millimeters between the center of one pupil to the center of the other. Having a correct pd on your vision prescription ensures that youre looking through the ideal spot in your lenses.
Your optician or eye doctor can measure your pd at your eye exam with an instrument called a pupillometer. Sometimes your pd is included on your prescription, but not always. Pupillary distance (pd) is the distance, in millimeters, between the center of one pupil to the center of the other. The pd is needed to manufacture your eyeglasses because it determines the exact optical center of the lens, which is the point where you look through the lens. The pupillary distance (pd) measurement is a requirement for people who want to purchase eyeglasses. Here, find out how to measure your pd using a mirror and a ruler. Pupillary distance (pd) measures the distance between the centers of your pupils and is used to center a prescription lens accurately in your frames. Your optician will usually measure your pd or you can use our digital pd ruler to measure it quickly online.
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