How to Read Eyeglass Temple Numbers: A Guide for Perfect Fit

Every pair of glasses carries a small but precise set of numbers etched into the inside of the temple arm — the piece that extends from the frame and rests behind the ear. These eyeglass temple numbers are not decorative. They are a standardised measurement system used by every frame manufacturer in the world, and they tell you everything you need to know about whether a frame will fit your face before you ever try it on. For anyone shopping for prescription glasses online, understanding these numbers is not optional — it is the difference between a frame that fits perfectly and one that causes daily discomfort.

This guide explains each number in plain terms, shows how to read them correctly, and explains how to use them to find frames that match your face at FuzWeb.

What Eyeglass Temple Numbers Tell You About Your Frame

The numbers on your eyeglass temples follow a universal format, always presented in the same order: lens width, then bridge width, then temple length. They are typically printed in sequence, separated by dashes or spaces, and look something like this: 52−18−140. Each number is measured in millimetres.

This three-number system is standardised across the global eyewear industry, meaning a frame marked 52−18−140 from one brand will have the same core dimensions as a frame with the same numbers from another. Once a wearer knows their ideal measurements, they can use them to shop with confidence across any brand or collection — including the full range of frames available at FuzWeb.

For a complete overview of how frame dimensions interact with face shape and prescription strength, see FuzWeb's glasses frame measurement guide.

Eyeglass Temple Numbers: Lens Width Explained

The first number in the sequence is the lens width, also called the eye size. It measures the horizontal width of a single lens in millimetres, from one edge of the lens to the other — not including the frame rim or any surrounding material. Only the optical zone itself is measured.

Typical lens widths range from 40mm to 60mm, with most adult frames falling between 48mm and 56mm. Smaller lens widths produce a more compact, refined look and are well suited to narrower or smaller faces. Larger lens widths create a bolder, more statement-making frame and suit wider or larger faces.

Lens width also has a practical impact on prescription lenses. For wearers with stronger prescriptions, a smaller lens width reduces the amount of lens material required, which in turn reduces thickness and weight. This is particularly relevant for high-index lenses — a topic covered in detail in FuzWeb's guide to lens index and choosing the right eyeglass lenses.

When comparing frames online, always check the lens width against a frame you already own and find comfortable. A difference of 2–3mm is usually noticeable; a difference of 5mm or more will produce a visibly different look and fit.

Eyeglass Temple Numbers: Bridge Width Explained

The second number is the bridge width — the distance in millimetres between the two lenses at their closest point. This is the measurement of the gap that sits over the nose, and it is one of the most important fit dimensions for comfort.

Typical bridge widths range from 14mm to 24mm. A bridge width that is too narrow will pinch the nose and cause pressure marks. One that is too wide will allow the frame to slide down the nose constantly, requiring repeated adjustment and causing the optical centres of the lenses to misalign with the pupils — which reduces visual clarity and causes eye strain.

Bridge width is closely related to nose shape and nose bridge height. Wearers with a lower nose bridge — common in East Asian facial structures — often find that standard bridge widths cause the frame to sit too close to the face or rest on the cheeks. In these cases, frames with a wider bridge or adjustable nose pads provide a significantly better fit.

If you are unsure of your ideal bridge width, measure the bridge of a frame you currently wear and find comfortable. That number is your baseline. FuzWeb's frame measurement guide explains how to take this measurement accurately at home.

Eyeglass Temple Numbers: Temple Length Explained

The third number is the temple length — the total length of the temple arm, measured from the hinge at the front of the frame to the very tip of the arm that curves behind the ear. This measurement includes both the straight section and the curved end section combined.

Temple lengths are standardised and almost always end in 0 or 5. Common lengths are 130, 135, 140, 145, and 150mm, with 140mm being the most common for adult frames. Shorter temples suit smaller heads or faces; longer temples are needed for larger heads to ensure the arm reaches comfortably behind the ear without pulling or pressing.

A temple that is too short will not reach behind the ear properly, causing the frame to sit unstably on the face. One that is too long will extend past the ear and press uncomfortably against the side of the head. The correct temple length holds the frame securely without any pressure points.

Some wearers measure temple length in two segments: from the hinge to the bend, and from the bend to the tip. Adding these two figures gives the total temple length — which is the number printed on the frame.

How to Use Eyeglass Temple Numbers When Shopping Online at FuzWeb

The most reliable method for finding a well-fitting frame online is to measure a pair of glasses you already own and enjoy wearing, then use those measurements as your target. Turn the frame over, locate the numbers on the inside of the temple, and note all three values: lens width, bridge width, and temple length.

When browsing FuzWeb's frame collection, every product listing includes the full frame dimensions. Filter by the measurements closest to your own, and you will immediately narrow the selection to frames that are likely to fit well — without needing to try them on in person.

The numbers are always read left to right in the same order: lens width − bridge width − temple length. A frame marked 54−16−145 has a 54mm lens, a 16mm bridge, and 145mm temples. Once this format is familiar, reading any frame's dimensions takes seconds.

For wearers ordering prescription lenses, frame dimensions also affect lens production. Lens width determines the minimum blank size required. Bridge width affects how the optical centres are positioned relative to the pupils — which is why an accurate PD measurement is equally important. See FuzWeb's guide on ADD, PD, and segment height explained for more on how these measurements interact.

Every prescription lens ordered through FuzWeb includes UV400 protection, HMC (Hard Multi-Coat), and AR (Anti-Reflection) coating as standard — not as paid upgrades. These coatings are included on every lens regardless of frame size or prescription strength. Optional upgrades include Photochromic, Anti Blue Light, Tinted, and Polarized lenses.

Ready to find your perfect frame? Browse the full collection at FuzWeb frames and use your temple numbers to shop with confidence. For a step-by-step walkthrough of the ordering process, visit ordering prescription lenses from FuzWeb in 6 easy steps.

Frequently Asked Questions: Eyeglass Temple Numbers

Where are the temple numbers located on my glasses?

The numbers are etched or printed on the inside surface of one or both temple arms — the pieces that extend from the frame and rest behind the ears. They are typically found near the hinge end of the temple and are presented as three numbers separated by dashes or spaces.

What order do you read eyeglass temple numbers?

Always left to right: the first number is the lens width, the second is the bridge width, and the third is the temple length. All three are measured in millimetres. A typical example would be 52−18−140.

What is a normal lens width for adult glasses?

Most adult frames have a lens width between 48mm and 56mm. Frames below 48mm are considered narrow or compact; frames above 56mm are considered wide or oversized. The right lens width depends on face width and personal style preference.

How do I know if the bridge width is right for my nose?

The bridge should sit comfortably on the nose without pinching or sliding. If your current glasses leave pressure marks on the sides of your nose, the bridge is too narrow. If they slide down constantly, the bridge is too wide. Measure the bridge of a comfortable pair and use that as your target when shopping.

What temple length do I need?

The most common adult temple length is 140mm. If your current glasses feel too short and don't reach behind your ear properly, try 145mm. If they feel too long and press against your head, try 135mm. Temple length is one of the easiest measurements to adjust for comfort.

Can I use my temple numbers to order glasses online?

Yes — this is exactly what they are for. Measure the numbers from a pair you already own and find comfortable, then match them as closely as possible when browsing online. FuzWeb lists full frame dimensions on every product page, making it straightforward to find a matching fit.

Do frame measurements affect my prescription lenses?

Yes. Lens width affects the minimum lens blank size and can influence thickness for stronger prescriptions. Bridge width affects how the optical centres align with the pupils. For progressive lenses, frame height also determines whether a full progressive corridor can be accommodated. FuzWeb's optical team reviews all frame and prescription details before production begins.