How to read your eyeglasses prescription
Finding your pupillary distance (more details):
Sometimes it is not listed or your ophthalmologist may not have taken the time to measure it correctly (it is often the optician who fine-tunes it). You can measure it yourself!
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Stand in front of a mirror about 20 cm away.
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Hold a ruler or tape measure horizontally against your eyebrows.
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Close your right eye and align the zero mark of the ruler with the center of your left pupil.
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Open your right eye. Read the length (in mm) that you can see at the center of your right pupil. This is your pupillary distance (PD).
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You can repeat the measurement several times (also measure from the right eye to the left eye). If you measure different lengths, use the average value.
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