Eyewear, explained
The Designer Glasses Editorial Team 
What is a spring hinge? A spring hinge is a small coiled spring built into the hinge barrel of a temple, letting the arm flex outward past its normal open position and then pull itself back. Instead of stopping rigidly at 180 degrees, the temple gives a little under pressure, which is meant to ease … Read more
A wooden frame is genuinely lighter and warmer against the skin than most acetate or metal, and no two pairs look quite the same because the grain runs differently through each one. The trade-off is that wood is less forgiving to adjust, more sensitive to moisture and sweat, and needs a specialist rather than a … Read more
Horn and buffalo horn frames are eyewear made from the keratin horn of water buffalo (or occasionally other cattle), cut, heated and pressed into shape rather than moulded from plastic. No two pieces look alike — the mottling, translucency and colour banding come from the animal itself, which is exactly the point for people who … Read more
Stainless steel in glasses is a durable, corrosion-resistant frame metal that sits between everyday alloys like Monel and premium options like titanium — stronger than most budget metals, heavier than titanium, and largely immune to the rust and skin discolouration that cheaper metal frames can develop over time. What exactly is stainless steel in a … Read more
Monel is a nickel-copper alloy, and it turns up in eyewear because it solders easily, holds a spring temper well, and resists corrosion better than plain steel — all at a manufacturing cost far below titanium. That combination is why so many metal frames, from budget to mid-range designer, use it somewhere, usually in the … Read more
Beta-titanium is a titanium alloy engineered to be more elastic than standard titanium, meaning it can flex and spring back rather than bend and stay bent. In eyewear, it turns up mostly in temples, hinges and thin structural parts where a frame needs to give a little under pressure without deforming or snapping. What makes … Read more
Titanium is a lightweight, corrosion-resistant metal used in eyewear because it lets a manufacturer build a frame that is thin, strong and unusually light on the face at the same time — a combination that steel, monel and most other frame metals can’t offer together. What it buys you is comfort over a long day … Read more
Optyl is a moulded epoxy resin developed in the 1960s as an alternative to acetate, and it’s the material behind much of the vintage eyewear that collectors chase today. It holds colour with unusual depth, resists warping, and has a slight give that lets a frame flex back into shape rather than snap. What is … Read more
A laminated acetate frame is made by fusing two or more sheets of acetate together — often different colours, patterns or finishes — before the frame shape is cut from the block. The result is a single piece of material with visible depth: one colour showing through another, or a solid tone backed by something … Read more
Acetate is a semi-synthetic material cut and shaped from solid sheet, block by block, frame by frame — which is why it can carry depth, layered colour and a warm, slightly matte hand-feel. Injection-moulded plastic is poured molten into a mould and set, which makes it faster and cheaper to produce but flatter in colour … Read more
About what you read here. Everything on The Designer Glasses is general information and our own editorial opinion. We research carefully and we say when the evidence is unclear, but we can be wrong, things change, and no article can know your particular situation. Please do your own research and make your own judgement rather than treating anything here as the final word. This is not medical advice, not a diagnosis, and not a substitute for speaking to an optometrist, optician or eye doctor about your own eyes, vision and eyewear. We are writers and researchers, not clinicians. We do not recommend prescription treatments or give doses. If something is painful, getting worse, or worrying you, please talk to a professional — going early is not an overreaction.