How Often Should You Replace Your Sunglasses?
Sunglasses don't come with an expiry date, but that doesn't mean they last forever — at least, not all of them. Here's how to know when it's time for a new pair, and how material quality affects the replacement timeline.
Signs of Lens Degradation
Lenses degrade over time, especially cheaper ones:
- Scratches — Even minor scratches scatter light and reduce visual clarity. If you can see scratches when holding lenses up to a light, they're affecting your vision.
- Coating damage — Peeling, bubbling, or crazing of anti-reflective or polarised coatings.
- Colour fading — If the tint has lightened, the UV-blocking coating may have degraded.
- Haziness — A general cloudiness that cleaning doesn't fix.
How Long Do UV Coatings Last?
This is the critical question. UV-blocking coatings on cheap sunglasses can degrade within 1-2 years, especially with regular exposure to sunscreen, salt water, and heat. Premium lenses with baked-in UV protection last significantly longer — often 5+ years with proper care.
The problem is that UV coating degradation is invisible. Your sunglasses still look dark, but they may be transmitting more UV than when new. This is why quality matters — better coatings last longer and protect you for longer.
Frame Fatigue
Different frame materials fatigue at different rates:
- Cheap plastic (acetate) — Becomes brittle within 1-2 years. Cracks and snaps.
- Metal — Metal fatigue from repeated flexing weakens frames over 2-3 years. Corrosion accelerates this in coastal environments.
- Nylon/TR90 — Better fatigue resistance, but still degrades over 3-5 years.
- Carbon fibre — Exceptional fatigue resistance. The material doesn't weaken with repeated use. Effectively permanent.
The Replacement Timeline
- Cheap sunglasses ($10-30) — Replace every 6-12 months. Sooner if scratched or damaged.
- Mid-range sunglasses ($50-150) — Replace every 2-3 years, or when lenses show wear.
- Premium sunglasses with carbon fibre frames — Frames last indefinitely. Lenses last 5+ years with proper care.
Why Carbon Fibre Outlasts the Rest
The ShadyMate Voyager represents the end of the replacement cycle. Carbon fibre frames don't fatigue, don't corrode, and don't degrade. With proper lens care, you're looking at years of perfect service — backed by a lifetime warranty on the frame.
Stop replacing. Start investing.
