If you've ever ordered sunglasses online only to have them slide down your nose, pinch uncomfortably, or sit lopsided on your face, you're not alone. The culprit is almost always the same thing: nose bridge fit. Most eyewear is designed for a narrow, high nose bridge, leaving millions of people struggling to find frames that actually stay put.
The good news? Once you know your nose bridge width and frame size, finding the right pair becomes dramatically easier, whether you're shopping in store or online. This guide walks you through exactly how to measure, what the numbers mean, and how to use that information to buy glasses online with confidence.
What Is Bridge Width in Glasses?
Bridge width (sometimes called nose bridge width) is the distance between the two lenses of a pair of glasses, measured at the narrowest point of the frame where it rests on your nose. It's listed in millimetres on the inside arm of a frame. For example, the numbers "52□20-140" mean: 52mm lens width, 20mm bridge width, 140mm temple length.
Your personal nose bridge width is the distance between the inner corners of your eyes at the point where a frame would rest. This is the number that determines whether a frame grips your nose comfortably or slides straight off.
Most people measure between 14mm and 24mm. A measurement of 19mm or above is generally considered a wide bridge.
What Is My Frame Size?
Frame size tells you how wide a pair of glasses can sit on your face before they start tipping forward or pressing at the temples. It's derived from your face width (specifically the distance across your cheekbones) and typically falls into Small, Medium, or Large.
Getting your size right matters just as much as bridge width. A frame that's too wide will tip forward; one that's too narrow will press uncomfortably at the sides of your head. Knowing your frame size means you can filter out glasses that won't work before you even look at styles.
How to Measure Your Nose Bridge Width at Home
There are several ways to find your measurements, ranging from a 30-second phone scan to a ruler you already own.
Method 1: The REFRAMD Fit App (Most Accurate)
The REFRAMD Fit App uses your iPhone's TrueDepth camera (the same technology behind Face ID) to build a precise 3D map of your face in about 3 seconds. From a single scan, it captures everything that determines eyewear fit: your face width at the cheekbones, nose bridge geometry, pupillary distance, pantoscopic tilt, and temple length. These are the same measurements an experienced optician would take by hand during a professional fitting.
From those measurements, the app produces your personal fit profile across three dimensions:
- Frame size (Small, Medium, or Large) based on your face width
- Bridge profile (Low, High, or Wide) based on the geometry of your nose
- Temple Length (Short, Medium, Long) to guide which Temple Length will fit you comfortably.
Method 2: The Ruler Method
- Stand in front of a mirror in good lighting.
- Hold a ruler horizontally just below your eyes, resting it lightly on your nose.
- Look straight ahead and measure the distance between the inner corners of your eyes (the pink corners closest to your nose).
- That measurement in millimetres is your nose bridge width.
Method 3: The Existing Frame Method
If you own a pair of glasses that fits well, check the numbers printed on the inside arm. The middle number is the bridge width, a reliable starting point when searching for new frames.
Why Standard Sunglasses Don't Fit Wide and Low Nose Bridges
The global eyewear industry has historically designed frames around a narrow, high nose bridge, a fit that works for many people of European descent but leaves out a significant proportion of the world's population.
People with low and wide nose bridges, as well as higher cheekbones, often struggle with conventional eyewear designed around a narrower range of facial geometries. These characteristics are common across many populations, including many people of East Asian, South Asian, Southeast Asian, African, and Latin American heritage. When frame geometry doesn’t match the face, glasses may slide forward, sit on the cheeks, or fail to make stable contact with the nose. This is why demand for low-bridge-fit, alternative-fit, and so-called Asian-fit eyewear has grown in recent years.
This isn't a personal problem. It's a design problem. And it's exactly why REFRAMD exists.
REFRAMD frames are engineered specifically for diverse people, including people with wide and low nose bridges, with a wider bridge opening and a flatter nose pad angle designed to sit comfortably on faces that standard eyewear ignores.
How to Buy Glasses Online with a Wide or Low Nose Bridge
Buying glasses online without trying them first is where most people go wrong. A few practical steps change that entirely:
- Always check the bridge width number. It's listed in the product specs. If your measurement is 18mm or above, look for a matching or wider frame bridge width.
- Search for "wide bridge fit", "low bridge fit", or "alternative fit" labels. These indicate the frame has been designed with your face proportions in mind, not retrofitted with workarounds.
- Be cautious with adjustable nose pads alone. These can help, but a frame engineered with the right bridge geometry from the start is always more comfortable and secure.
- Check the return policy. Even with the right measurements, fit can vary slightly. A generous return window gives you confidence to try.
How the REFRAMD Fit App Helps You Buy Glasses Online
The REFRAMD Fit App goes beyond giving you a number. Once your fit profile is established, the app's recommendation engine scores every frame in the REFRAMD catalogue against your profile across five criteria: frame width alignment, bridge width range match, frame size, bridge type compatibility, and bridge crest height.
Every frame receives a fit verdict (Excellent Match, Strong Match, Good Match, Check Match, or Poor Match) along with the specific reasons behind the score. Rather than surfacing the most popular styles or newest arrivals, the app shows you the frames most likely to feel as good as they look.
It also flags what to avoid: bridge widths that will pinch, frame widths that will tip, temple lengths that won't reach your ears. For anyone who has ever bought sunglasses for a wide nose bridge online and had them arrive feeling completely wrong, that guidance alone is a game-changer.
The app is particularly useful if you have a low bridge fit requirement, a flat nasal bridge, or high cheekbones, face characteristics that are extremely common but almost entirely ignored by traditional eyewear sizing.
Frequently Asked Questions
What is a wide nose bridge for glasses? A wide nose bridge is generally considered to be a personal nose bridge measurement of 18mm or above (the distance between the inner corners of your eyes). Frames designed for wide nose bridges have a wider gap between the lenses to sit comfortably without pinching or sliding.
What is low bridge fit? Low bridge fit (also called alternative fit or Asian fit) refers to frames designed for people whose nose bridge sits at or below the level of their pupils, or whose nose bridge is flatter or wider than the standard frame assumes. These frames typically feature a wider bridge, a flatter nose pad angle, and a higher lens placement to prevent the frame resting on the cheeks.
How do I know if I need wide bridge fit glasses? If standard frames slide down your nose, sit too close to your face, rest on your cheeks, or leave marks at the sides of your nose rather than on the bridge, you likely need wide bridge fit or low bridge fit frames. Measuring the distance between your inner eye corners will confirm it: 18mm or above means wide bridge fit frames are the right place to start.
Can I measure my nose bridge with my phone? Yes. The REFRAMD Fit App uses your iPhone's TrueDepth camera to measure your nose bridge geometry, face width, and other key fit dimensions in a single 3-second scan. It's the most accurate way to find your measurements without visiting an optician.
What does the bridge number mean on glasses? The bridge number on glasses (the middle number in the sequence printed on the inside arm, e.g. "52□20-140") is the distance in millimetres between the two lenses at the narrowest point. The higher this number, the wider the space across the nose. People with wide bridges should look for a bridge number of 18mm or higher.
Finding sunglasses that actually fit shouldn't take three failed orders and a drawer full of frames you never wear. Know your measurements, use the right tools, and shop with confidence. Once you know your number, it never has to be a guessing game again.
Not sure which REFRAMD frames match your nose bridge width? Use the REFRAMD Fit App to get your personal fit profile in 30 seconds, or browse our full collection of wide bridge fit sunglasses. Every product page includes detailed measurements so you can shop with confidence.
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