Your pupillary distance (pd) can usually be found in the optometry sheet. If you do not have or forget the pd value, you can measure it manually. PD is measured in millimeters (mm). You can read "How to measure pd?"
The PD you fill in, the equivalent of the frame formula :(frame width + bridge width - pupil distance)/2, which is the center shift of the matching lens. Preferably less than or equal to 3. The smaller the value is, the closer the optical center of the lens (PD) is to the center of the frame, the smaller the prism degree of the lens, the better the visual field comfort, and the thinner the lens edge. We use "RED mm" in the product price column. For reference only!
You can usually find your measurements on the inside of your temple. The overall frame size is a combination of lens and bridge's width. Once you do, just enter them in the fields below. You can compare themeasurements to your current frame.
The filter result is that your frame width size is increased or decreased by 3mm; Please choose large or small glasses according to the comfort of your glasses, Try to let the pupil of the eye is near the center of the lens. The result is only a reference size, wearing effect in kind prevail.
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