Frame size is determined by the overall width of a frame. We measure the width of our frames from hinge to hinge on the inside of the temples.
You can find your fit using a measuring tape or ruler. Hold the ruler along the bottom of your forehead, right above the eyes, from temple to temple. Make sure the ruler doesn't bend. Use this number to find your frame size. You will be able to shop slightly narrower and wider than your size.
We measure the height of our frames at the tallest part of the frame. This number includes the frame on both the top and bottom of the lens.
We measure temple length starting at the hinge and extending to the end of the arm. Please note that we do not measure around the curve of the temples, and instead measure straight back. If you are comparing your prescription eyewear measurements, your temple length may be different at Readers.com.
We measure bridge size at the narrowest part of the bridge. This number includes the frame on both sides, and is measured from lens edge to lens edge.