How Eyewear Is Made

A pair of glasses looks simple: a front, two temples, a couple of hinges. Getting from a manufacturer's raw material to a frame a buyer can actually sell involves a fairly specific sequence of steps — and knowing that sequence is useful whether you're designing a custom run or just trying to understand why one factory's minimum order or lead time looks different from another's.

Choosing a frame material

Everything starts with the material. The most common is acetate, a plant-based plastic prized for its depth of colour and the way it can be layered and polished. Its variants — bio-acetate and recycled acetate — use renewable or reclaimed feedstock instead of virgin material, at a small cost to colour consistency between batches.

Metal frames are built from stainless steel, titanium, or aluminium, chosen for weight and durability rather than colour depth. Lightweight synthetic options like TR90 and injected plastic trade some of acetate's richness for flexibility and a lower unit cost at volume.

Some frames don't fit neatly into one category — a combination of materials, like an acetate front with metal temples, or a genuinely unusual pairing. We've covered one extreme example of this on the blog: Uptitude built its frames from a laminate of reclaimed snowboard wood and acetate, specifically to get a workable, durable material out of something that would otherwise have been thrown away.

From design to blank

A frame begins as a technical drawing — the outline, the bridge, the temple length, all specified before any material is cut. For acetate, sheets or laminated blocks are cut down to a rough blank slightly larger than the final part. For custom or OEM designs, this is the point where a sketch or an existing silhouette gets translated into that first technical drawing — see stock vs. custom eyewear manufacturing for how that path differs from ordering an existing stock design.

From there, the blank is milled — traditionally on a pantograph that traces a template, more often today on a small CNC mill — to cut the front and temple pieces to their approximate shape, including the initial lens openings.

Shaping the front

Most frame fronts aren't flat — they curve slightly around the face for a closer, more wraparound fit. That curvature is known as meniscus shaping, and it's one of the harder things to get right with an unconventional material: a rigid or brittle blank simply won't hold the curve. It's also why some material innovations need a second, more workable layer — bonding a thin sheet of acetate onto a stiffer base, for instance — before the curve is stable enough for full production.

Finishing

Once a frame is cut and shaped, its surface still needs work. Acetate can be brought to a glossy, mirror-like shine, left with a soft matte finish, or given a sanded, tactile texture — each requiring a different polishing process and, usually, a different amount of hand finishing. Finish is a design decision as much as a technical one: the same frame in the same colour reads completely differently depending on how its surface catches light.

Hinges and hardware

The hinge is a small part that gets a lot of wear. A standard hinge is the simplest and cheapest to produce; a spring hinge adds a small amount of give so the temples flex outward under pressure instead of stressing the frame at the joint; a screwless hinge removes the visible screw for a cleaner look, usually at a higher manufacturing cost. Which one a manufacturer defaults to says something about whether they're optimising for price or for durability.

Measurements that define fit

Three measurements do most of the work of making a frame fit: the lens width, the bridge width between the lenses, and the temple length from hinge to ear. Get these wrong relative to a person's face and no amount of finishing quality will make the glasses comfortable — which is why they're required, not optional, information for every frame in production, and why they're worth checking as closely as material or colour when evaluating a supplier.

Branding: making it yours

A frame doesn't have to carry its manufacturer's name. Temples are commonly left blank at the milling stage specifically so a logo can be printed or engraved later — the same physical frame can leave the factory under a dozen different brands. This is the mechanic behind private-label and white-label sourcing: the manufacturing process doesn't change, only the branding step at the end of it.

We've written a longer guide on this specifically for buyers sourcing sunglasses under their own name: white label sunglasses manufacturing.

Packaging and presentation

The last manufacturing decision isn't about the frame at all — it's about what happens when someone opens the box. A presentation box, a protective case, and a cleaning cloth complete a brand's identity all the way to unboxing; skipping custom packaging is a legitimate choice too, usually made by buyers who already have their own fulfilment and packaging solution downstream.

From factory to your shelf

None of the above matters to a buyer if the order itself doesn't work commercially. Every manufacturer sets their own minimum order quantity, lead time, and whether a sample is available before you commit to the full order — and all three vary a lot more than the underlying manufacturing process does. A factory that's excellent at meniscus shaping and finishing is still the wrong fit for a first order if its minimum is ten times larger than what a new brand needs.

We've covered how to evaluate that side of sourcing separately, including what a genuinely low minimum order looks like in practice: low MOQ eyewear manufacturing.

Related reading: White label sunglasses manufacturer · Low MOQ eyewear manufacturer