How do eyeglass frame sizes work?

Eyeglass frame sizes work with three numbers, usually printed on the temple: lens width, bridge width, and temple length, measured in millimeters. For example, 54-18-145 means a 54 mm lens, an 18 mm bridge, and a 145 mm temple. These numbers help buyers match frames to different face shapes and market preferences. READSUN produces custom optical frames in all standard sizes.

Eyeglass Frame Sizes Explained for B2B Buyers

Eyeglass frame sizes explained: the three-number system tells you the key measurements of a frame. It is the fastest way to compare frames across models and suppliers. The numbers are always in millimeters.

Some frames also print the frame width or lens height. These extra numbers help with fit, but the three main numbers are the standard for optical frame sizes. Buyers should always confirm the size before placing a wholesale or OEM order.

Eyeglass Frame Sizes Chart: What Each Number Means

Below is a simple eyeglass frame sizes chart to help you read the markings on any frame.

• 54-18-145: 54 mm lens, 18 mm bridge, 145 mm temple. A common adult size.
• 50-16-140: 50 mm lens, 16 mm bridge, 140 mm temple. A smaller adult or teen size.
• 58-20-150: 58 mm lens, 20 mm bridge, 150 mm temple. A larger or wide-fit size.
• 46-14-135: 46 mm lens, 14 mm bridge, 135 mm temple. A kids or petite size.

These are examples. Actual sizes vary by model and material. For eyewear frame sizes, always use the factory specification sheet, not an online guess.

Optical Frame Sizes and Market Preferences

Different markets prefer different optical frame sizes. Understanding these preferences helps B2B buyers choose the right inventory.

• North America and Europe: Often prefer medium to large lens widths (52–58 mm) and longer temples (145–150 mm).
• Asia: Often prefer smaller lens widths (46–52 mm), shorter temples (135–145 mm), and lower bridge fit.
• Kids and teens: Smaller lens widths (40–48 mm), shorter temples (125–140 mm), and flexible materials.
• Sport and safety: Wider frames with secure temple grip and larger lens coverage.

When you source for multiple markets, a size range is better than a single size. READSUN supports custom optical frames in all standard sizes, plus custom sizing for OEM programs.

Eyeglass Frame Sizes: Specifications B2B Buyers Should Confirm

Before approving a quotation or sample, confirm these size details:

• Lens width: width of one lens in mm.
• Bridge width: distance between lenses in mm.
• Temple length: hinge to tip in mm.
• Frame width: total front width in mm.
• Lens height: vertical lens height in mm.
• Size markings: where they are printed and in what format.
• Size range: how many sizes you need per model.
• Market fit: which size suits your target region.

Eyeglass Frame Sizes: MOQ, Lead Time, and Pricing

MOQ, lead time, and pricing depend on the frame size and order model. Stock frames in standard sizes have lower MOQ and faster lead time. Custom sizes require new tooling or adjustment, so they usually need higher MOQ and longer lead time. Material also affects cost: acetate, TR90, titanium, and stainless steel have different production processes.

For an accurate quotation, share your target sizes, quantity per size, material, logo, and packaging. READSUN will recommend the best production path.

How READSUN Runs Eyeglass Frame Sizes on the Line

READSUN Optical is a B2B eyeglass frame manufacturer with full control over frame sizing. We produce frames in all common sizes and support custom size development for OEM programs. Our team checks lens width, bridge width, temple length, frame width, and size markings at every stage.

Buyers can order stock sizes, adjust existing sizes through ODM, or create new sizes through OEM. Learn more about our Manufacturing Excellence or review our OEM & ODM eyewear services.

Need help choosing eyeglass frame sizes for your market? Contact READSUN Optical with your target sizes, quantity, and market needs.

Eyeglass Frame Sizes FAQ

What do the numbers on eyeglass frames mean?

The numbers show lens width, bridge width, and temple length in millimeters. For example, 54-18-145 means 54 mm lens, 18 mm bridge, and 145 mm temple.

How do I know my eyeglass frame size?

Check the inside of the temple. The size is usually printed there. If not, measure the lens width, bridge, and temple length with a ruler in millimeters.

What is a standard eyeglass frame size?

A common adult size is 54-18-145. However, standard sizes vary by market. North America and Europe often use larger sizes, while Asia often uses smaller sizes.

Can I order custom eyeglass frame sizes?

Yes. READSUN supports custom sizing for OEM programs. MOQ and lead time depend on the size change and material. Contact us with your target size for an exact quote.

How do I choose eyeglass frame sizes for my market?

Review your target market and customer base. North America and Europe often prefer medium to large sizes. Asia often prefers smaller sizes. Kids and teens need smaller, flexible frames.

Request an eyeglass frame quote from READSUN Optical today. Share your target sizes, quantity per size, material, and branding needs, and our team will recommend the best solution for your program.