Eyewear, explained
The Designer Glasses Editorial Team 
A frame is worth repairing when the damage is mechanical rather than structural — a loose hinge, a snapped screw, a bent temple, a cracked nose pad — and the material underneath is sound. It stops being worth it once the break runs through the frame’s core structure, keeps recurring, or the frame was never … Read more
There’s no fixed expiry date on a pair of glasses. A well-made frame in good material can last a decade or more; the lenses inside it usually need replacing sooner, often every two to three years, because coatings wear and prescriptions change. Frame and lens age separately, and it’s worth knowing which one is failing … Read more
Sweat is salty and slightly acidic, and sunscreen is a cocktail of oils, alcohols and UV-filtering chemicals designed to bind to skin. Neither is designed with metal plating, acetate, or lens coatings in mind. Left on a frame, both accelerate corrosion, cloud coatings, and can soften or discolour acetate over time. None of this happens … Read more
Glasses slip in hot weather because skin gets oilier and sweatier, which reduces the friction that normally holds nose pads and temple tips in place, and because some frame materials soften very slightly at skin temperature. The fix is rarely the frame itself — it’s usually the nose pad contact, temple length, or weight distribution … Read more
Glasses fog because warm, moisture-laden air — usually breath — hits a lens surface that is colder than the air itself, and the water vapour condenses into visible droplets. Anything that widens that temperature gap, or channels breath upward across the lens, makes it worse. Anything that closes the gap or redirects the airflow helps. … Read more
New glasses often feel wrong at first because the eyes, not the frame, are doing most of the adjusting. A different lens shape, a slightly different tilt or position on the face, or a genuine change in prescription all ask the brain to recalibrate — and that recalibration usually settles within a few days to … Read more
Most glasses benefit from a professional check every six months, and an adjustment whenever they start slipping, pinching, or sitting unevenly — whichever comes first. There’s no fixed schedule that suits everyone; frame material, how often the glasses come off, and daily habits all change how quickly fit drifts. Is there an actual recommended interval? … Read more
Frames lose their shape through a combination of heat, pressure and repeated small stresses — being sat on, left on a warm dashboard, folded the wrong way night after night, or simply worn past the point where the material can spring back. Acetate softens and drifts; metal fatigues and bends; hinges loosen and let the … Read more
Glasses should be stored folded, lenses facing up, inside a rigid case, somewhere that stays at roughly room temperature and out of direct sun. The three enemies are pressure on the lenses, heat that can warp frame material or soften adhesives, and the kind of loose storage — bags, pockets, tabletops — that invites scratches … Read more
Coatings craze because the coating and the lens underneath expand, contract and age at different rates. A sudden temperature change, a harsh chemical, or simply years of wear can crack the thin coating layer into a fine, web-like pattern. Once that cracking has started, it cannot be polished away or reversed — the coating, or … 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.