Eyeballing Your Eyeglasses: A Visual Guide to DIY Frame Measurement In the old days, when you used to pay steep prices to buy glasses from the local optical store, you could try them on to see how they fit. Buying glasses online is uncharted territory for many, but there's no need to worry! The good news is that it's easy to find your frame measurements to ensure you're getting the right fit. The better news is you're going to save a bundle ordering glasses from Tonic. Follow the handy guide below to measure your glasses and make shopping easy! Once you find your frame measurements, you can browse our selection, find the style you want, and order the perfect pair of glasses.
Measure horizontally across the entire front of the frame. Include any lug or hinge pieces that stick out on the sides.
Measure the lens vertically, at its tallest point. For bifocal or progressive prescriptions, the lens height must be at least 30 mm.
Measure horizontally, at the top of the bridge, from the edge of one lens to the other.
Measure from the hinge—where the arm connects in the front— to the spot where the arm begins to bend down around the ear. Then measure from the top of the bend to the bottom tip. Add the two sections together for the total temple arm length.
Measure the lens horizontally, at its widest point. Make sure the lens width accommodates your pupillary distance so that your eyes align with the “optical center” of the lens.
If the SPH on your prescription is +/-6.00, it’s best to stick with lens widths lower than 50 mm. This will keep your lenses thinner.
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