The answer is yes and no! For children, the answer is yes. This will result in the potential for blurred vision, double vision or just general discomfort with the glasses. Even being off a few millimeters can induce prismatic effects depending on your prescription and type of glasses. Having an accurate measurement of your pupillary distance is crucial to ensure clear, comfortable vision in your glasses. If using the Dual PD method, it is recommended that you subtract 1.5 mm from each eye’s measurement. If you are ordering reading only glasses, you can calculate your near PD by subtracting 3mm from your distance PD. Your near PD is different because our eyes naturally converge (turn in) while reading so our PD changes slightly during this viewing distance. Having this exact measurement allows for each lens to be made exactly for your eyes! Reading (Near) Vision Only GlassesĪn important fact is that when we measure PD this is considered your distance PD. What is the difference between the two measurements? In theory, the dual PD is more accurate as it measures the distance in each eye exactly, which is not always symmetric!. This is often recorded at 32/32, with the right eye measurement as the first number. It will be just one number, such as 64mm.ĭouble PD is made up of TWO measurements: the distance between the right pupil and the bridge of the nose and then the distance between the left pupil and the bridge of the nose. Single PD refers to the total distance, in millimeters, between the center of one pupil to the center of the other pupil. If your prescription does not have it on it, we’ll explain how to measure it yourself! What is Single PD vs Double PD When writing out your prescription, most doctors will measure this for you. It tells you where your eyes are most frequently pointed in the glasses and thus how they should fit you best. When purchasing glasses online, particularly prescription glasses, this number is crucial for proper fit. Your PD’s number represents, in millimeters, the distance between your pupils. When it comes to ordering prescription glasses, one of the questions you might ask is “what is pupillary distance (PD)?” or “How do I measure pupillary distance?” The answer is crucial to your online order, so don’t just shrug it off! We’ve got the lowdown on what exactly pupillary distance is, why it is important, and how to measure it. Some of these difficulties don’t yet have easy solutions. You can’t know 100% if that shirt will fit, or if that table will look the same in person. Ordering items online sometimes gets tricky.
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