What to Remember
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Most people replace prescription glasses every one to two years, roughly when eyeglass prescriptions expire under state law.
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Timing depends on your vision, not the calendar, so replace sooner if you notice blur, eye strain, or headaches.
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Damaged lenses, worn coatings, or loose frames are valid reasons to replace even when your prescription hasn't changed.
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Adults over 40 often need updates more often as presbyopia (age-related near-vision loss) sets in.
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Sometimes you only need new lenses, not a whole new pair.
How often should you replace prescription glasses?
Here's the short answer: most wearers get new glasses every one to two years, but the glasses themselves don't carry an expiration date. What expires is your prescription.
The FTC notes that eyeglass prescriptions 'usually are good for a year or two,' but state law sets the actual period. Most states cap validity at one to two years, though a few states differ — Florida, for example, allows up to five.
So the 'every one to two years' rule of thumb is really about prescription validity. The true trigger for replacement is a change in your vision or the condition of your glasses, not a date on the calendar.
What are the signs it's time for new glasses?
The clearest signal is your own comfort. Watch for these everyday clues:
- Blurry vision, squinting, or trouble focusing up close or far away.
- Eye strain, headaches, or fatigue after screen time or reading.
- Deep scratches or coating 'crazing' — a spider-web haze — that cleaning won't fix.
- Frames that sit loose, bent, or uncomfortable on your face.
That haze matters more than it looks. Consumer Reports notes that modern lens coatings are built to last the life of a prescription, about 28 to 30 months. When they fail, they can genuinely blur your view.
Good news: at BonLook, anti-reflective and scratch-resistant coatings come standard on every pair.
One reassuring note: wearing an outdated prescription won't permanently harm adult eyes. The Cleveland Clinic confirms it causes temporary strain, headaches, or blur that clears once you update, so this is about comfort and clarity, not fear.
Has your prescription actually changed?
The only way to know for sure is a comprehensive eye exam. We recommend booking one with your optometrist whenever your vision feels off.
How often should that be? Here the experts diverge, so it helps to see both. The American Optometric Association (AOA) has long advised exams every one to two years for most adults, and annually for those 65 and older.
Its updated guideline now leans toward annual exams for all adults. The American Academy of Ophthalmology (AAO) is more conservative for younger adults, suggesting every five to ten years for healthy adults under 40. Children's eyes change fastest, so the AOA recommends a check before first grade and yearly after that.
One rule is firm: an expired prescription can't legally be used to order new glasses. If you're unsure how to read yours, our in-store opticians are happy to walk you through it.
Does your age change how often you should replace them?
In a word, yes. Your life stage is one of the biggest factors in how often your prescription shifts.
- Kids and teens: eyes change quickly, often calling for updates every six to twelve months.
- 20s and 30s: prescriptions usually settle, since myopia (nearsightedness) tends to stabilize after about age 21.
- 40s to 60s: presbyopia arrives around 40 and progresses into the mid-60s, so expect more frequent updates.
- 60 and up: near-vision changes taper off, and updates typically slow down again.
Whichever stage you're in, BonLook frames work with single-vision, progressive, and bifocal prescriptions, so your glasses can keep pace with your eyes.
Do you need a whole new pair, or just new lenses?
If your frames are structurally sound and you still love them, you can often keep them and replace only the lenses. It's a smart way to save.
There's one catch worth knowing. Single-vision lens swaps are straightforward, but progressive lenses (the kind with a smooth top-to-bottom range for distance and reading) are trickier. Zeiss notes they need precise centering to your frame, so moving old progressives into brand-new frames works only in very few cases.
Lean toward a full new pair in a few cases. Think bent or damaged frames, a wish for a style refresh, or a lens-tech upgrade like blue-light filtering or transitions. Frame material plays a role in longevity, too, and BonLook offers acetate, metal, titanium, and bio-acetate options.
Frames start at $149 with coatings included, plus a virtual try-on tool, free shipping over $80, and free 30-day returns. That makes pairing a vision update with a fresh look refreshingly low-risk.
Ready for the next step? Our virtual try-on tool makes finding your next favorite pair easy from home.
