Ideally you will have a prescription from your eye-care provider. If the ‘PD’ – pupillary distance – is not recorded on your prescription, the first port of call it to contact your optometrist over the phone and request your PD reading(s). In most cases, they will hold this on your file, and will release this data to you. Sometimes, there is a reluctance to provide you this information. In such cases, and only for single vision lenses, you can use a digital PD measuring tool like https://www.accupd.com
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