Specs Frame Size Chart: My Simple Breakdown

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Specs Frame Size Chart: My Simple Breakdown


When I first looked at a specs frame size chart, I was confused by all the numbers and diagrams. Here's how I finally made sense of it all.


The Basic Three Numbers

Every pair of specs has three key measurements printed inside, like "52-18-140":


52 - Lens width in millimeters
18 - Bridge width in millimeters
140 - Temple length in millimeters


Why These Numbers Matter

Each measurement affects fit differently:


Lens width - Determines if frames look proportionate on your face
Bridge width - Affects comfort on your nose
Temple length - Ensures arms reach properly behind ears


How I Use Size Charts

My process is simple:


Find specs I own that fit well
Write down their three numbers
Look for new specs with similar measurements
Stay within 1-2mm of my ideal size


Common Size Ranges

Most specs fall into these categories:


Small: 48-50mm lens width
Medium: 51-54mm lens width
Large: 55mm+ lens width


My Key Takeaway

Once I understood what the numbers mean, size charts became incredibly useful. They're not complicated - just three simple measurements that ensure proper fit.