How to Measure Frame Size

Finding the perfect eyeglasses isn't just about style—it's about fit. Properly sized frames ensure comfort, optimal vision correction, and a flattering look. Whether you're shopping online or trying to match your current favorite pair, understanding frame measurements is essential. Let's break down how to measure and interpret eyeglass frame sizes.

Key measurements for eyeglass frames

Understanding Frame Size Numbers

Look at the inside of your frame's temple (the arm that extends over your ear). You'll often find a series of numbers that look something like this: 50□23-141. These numbers represent the key measurements of your frames in millimeters:

Additional Important Measurements

Frame Height

As shown in our diagram (50mm), the height of the lenses is important, especially for progressive or bifocal lenses. This is measured vertically at the tallest point of the lens.

Total Frame Width

The overall width of the frame from temple to temple (136mm in our example) helps ensure the frames aren't too narrow or wide for your face. This measurement is particularly important if you have a wider or narrower face than average.

How to Measure Your Current Frames

If you have a pair of glasses that fit well, you can use them as a reference. Here's how to measure them:

1. Lens Width: Using a millimeter ruler, measure the horizontal width of one lens at its widest point.
2. Bridge Width: Measure the distance between the lenses (the piece that sits on your nose).
3. Temple Length: Measure from the hinge to the end of the temple arm.
4. Frame Height: Measure the vertical height of the lens at its tallest point.
5. Total Width: Measure the entire horizontal width of the frame from one temple to the other.

Finding Your Perfect Fit

When shopping for new frames, use these measurements as a guide, but remember that different frame styles and materials may fit differently even with the same measurements. Here are some tips for finding your perfect fit:

• Face Width: The total frame width should be roughly the same width as your face. Frames shouldn't extend beyond your face or squeeze your temples.
• Bridge Fit: The bridge should sit comfortably on your nose without pinching or sliding down.
• Temple Length: Temples should be long enough to reach your ears without pressing too tightly against the sides of your head.
• Weight Distribution: Frames should distribute weight evenly and not leave marks on your nose or behind your ears.
• Eye Positioning: Your eyes should be centered in the lenses both horizontally and vertically.

Frame Size Categories

Frames generally come in these size categories, though exact measurements can vary by brand and style:

Why Proper Sizing Matters

Correctly sized frames aren't just about comfort—they affect how well your prescription works. Improperly sized frames can cause:

• Distorted vision if your eyes aren't properly aligned with the optical center of the lenses
• Headaches or eye strain from frames that are too tight or position the lenses incorrectly
• Discomfort from pressure points on your nose, temples, or ears
• Frames that slip down your nose or feel unstable

Taking the time to understand your frame measurements ensures you'll find glasses that not only look great but feel comfortable and provide optimal vision correction. If you're unsure about your measurements, our optical experts are always available to help you find your perfect fit.