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Ensure your prescription is current (usually within 1–2 years). You can upload a photo of it or enter the numbers manually on most sites.

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This is the distance (in mm) between your pupils. If it's not on your prescription, you can measure it yourself: Ensure your prescription is current (usually within 1–2

Specifically for driving. These are always slightly tinted and change from green/yellow to reddish-brown based on light intensity. 2. Get Your Measurements Ready If it's not on your prescription, you can

Designed for light-sensitive eyes. These get extra dark outdoors and—crucially— by reacting to visible light, not just UV rays. Polarized Rectangle Sunglasses $300.00$450 readygolf.com& more Go to product viewer dialog for this item.

Sites like Kits and GlassesUSA offer free digital PD tools that use your webcam or a standard magnetic card (like a gift card) for scale. 3. Where to Buy Online

Stand 8 inches from a mirror. Hold a millimeter ruler against your brow. Line up "0" with your left pupil and read the measurement at your right pupil.