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PD Range
Pupillary Distance (PD) is the distance between the centers of your pupils and provides the exact optical center of your lenses.
Prescription Range
Frames are available if your sphere (SPH) value falls within this range.
Bifocal
Lenses with two viewing areas separated by a visible line.
Progressive
No-line multifocal lenses that correct up to three viewing areas.
Lens Height
Measure the lens vertically at its tallest point.
Bridge width
At the top of the bridge, measure horizontally one lens edge to the other.
Temple Arm
Measure from the hinge to the bend, and then the bend to the end of the arm. Add the two measurements together.
Lens Width
Measure the lens horizontally at its widest point.
