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This is the distance between your pupils in millimeters. It tells the lab where to align the optical center of your lenses. If your doctor didn't write it down, most online shops have a simple digital tool or a printable ruler to help you measure it yourself. 2. Decode the Frame Measurements

Let’s be real: walking into a traditional optometrist’s office can feel like a trap for your wallet. You find a pair of frames you love, only to realize they cost more than your monthly car payment. buy cheap frames online

Before you shop, you need two things that aren’t always on your printed prescription: This is the distance between your pupils in millimeters

This is where cheap glasses become expensive. Anti-reflective and anti-scratch coatings are usually worth the extra $5–$10. However, unless you have a very high prescription, you can often skip the "high-index" ultra-thin lenses. Also, think twice about blue-light blockers—many experts suggest they aren't strictly necessary for everyone. The Bottom Line Before you shop, you need two things that

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