This refers to the horizontal position of your pupils behind your lenses.ĭual PD accounts for the distance from the centre of your nose to the centre of each of your pupils in each eye. This is rarely done online and is not addressed in optician regulations, but we think this needs to change.”Ĭheck out this article which explains the workings of progressive lenses. ![]() “If you’re buying varifocals, it’s vitally important to position the pupils not just horizontally but vertically in the lenses. For the extra time, this method will prevent any vertical misalignment of your pupils behind your lenses.Īccording to a recent article by “Which?” many online retailers rarely consider ocular centres for their varifocal customers. We use this method to make your lenses as accurate as possible. Your measurements are for your perspective of left and right, not your assistants.Brace the ruler on the side of your nose and the frame/lens.If it helps, close one of your eyes to help you see the ruler.Use a plastic ruler to prevent scratches. ![]()
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