How to Know What Size Glasses I Need: What I Learned

For the longest time, I had no idea how to know what size glasses I need. I'd just try on random frames and hope something worked. After years of ill-fitting glasses, I finally figured out a systematic approach.

Start With What You Already Have

The easiest way to determine your size is to check glasses you already own that fit well. Look on the inside of the temple arm - you'll see three numbers like "52-18-140". Write these down. These are your baseline measurements.

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Measuring Your Face for Glasses

Here's the method I use:

Face width - Measure from cheekbone to cheekbone (mine is 143mm)

Nose bridge - Measure across the bridge of your nose (I need 18mm minimum)

Temple to ear - Measure from your temple to behind your ear (about 145mm for me)

These measurements tell you what frame dimensions to look for.

Understanding Size Categories

Most glasses fall into size categories:

Small - Lens width 48-50mm, total width under 130mm

Medium - Lens width 51-54mm, total width 130-140mm

Large - Lens width 55mm+, total width over 140mm

I fall into the large category, which immediately narrows down my options when shopping.

The Try-On Test

Even with measurements, I always do a fit check:

Frames shouldn't extend past my face width

Eyes should be centered in the lenses

No pressure points on temples or nose

Frames stay put when I move my head

What I Wish I'd Known Earlier

The biggest lesson? Don't guess. Take five minutes to measure properly, and you'll save yourself from countless returns and uncomfortable frames. Knowing your size makes shopping for glasses actually enjoyable instead of frustrating.