Most people treat a change in prescription the same way they treat a flat tyre something's gone wrong, so the whole thing needs replacing. You walk into an optician, the prescription has shifted, and before you know it you're being shown racks of new frames. What rarely gets mentioned is that your old frame is usually fine. It's the lenses that have done their job and need swapping.
That's the gap reglazing fills. Instead of buying a complete new pair, you keep the frame you already own and have fresh lenses fitted to your current prescription. For a lot of people it's the cheaper, more sensible option, and once you understand how spectacles are actually priced, it's easy to see why.
What reglazing actually involves
Reglazing is the process of removing the old lenses from your existing frame and cutting new ones to fit. With a postal service like the one at Johnny Goggles, you send in the frame, the lab edges your new lenses to match the shape, and the finished glasses come back to you. The frame never changes. Only the part of the glasses doing the optical work gets renewed.
It works for single vision, varifocals, bifocals, and prescription sunglasses. You can also use the moment to upgrade what's in the frame rather than just replacing like for like, which I'll come back to.
The part of your glasses you actually pay for
Here's something the high street doesn't always make obvious. When you buy a pair of glasses, a large chunk of the price is the frame, especially if it carries a designer name. A pair of acetate frames from a well known brand can run to £150, £200, or more on its own. The lenses are often the cheaper component.
So when your prescription changes slightly and you replace the whole pair, you're paying again for a frame that hasn't worn out. Reglazing skips that. You're only paying for the lenses and the fitting, which is why people are often surprised at the difference in cost when they first try it. If you spent good money on frames you love, reglazing protects that investment instead of writing it off every couple of years.
When reglazing makes the most sense
It isn't the right answer for every situation, but there are a few where it almost always is:
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Your prescription has changed but the frame is in good shape. This is the classic case. Nothing is broken; your eyes have simply moved on.
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The lenses are scratched or hazy. Coatings wear, and once a lens is scratched in your line of sight there's no polishing it out. New lenses, same frame.
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You want better lenses than you originally bought. Maybe you skipped the anti-reflective coating last time, or you've decided thinner lenses are worth it now that you have a stronger prescription.
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The frame is discontinued or hard to replace. If you've finally found a shape that suits you and the model is no longer sold, reglazing is the only way to keep wearing it.
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You want prescription sunglasses. A pair of sunglasses you already like can often have prescription lenses fitted, which is far cheaper than buying prescription sunglasses outright.
The thing people forget: the frame already fits
A frame that sits right is harder to find than most people realise. The bridge has to suit your nose, the arms have to reach your ears without pinching, and the lens height has to work with how you actually look through them. When you've worn a pair for a year or two and they've stopped giving you headaches or sliding down your face, that's a frame worth keeping.
Buy a brand new pair and you're starting that whole settling-in process again. You're also gambling on whether the new shape genuinely suits you under shop lighting, which is not the same as living with it. Reglazing lets you keep the fit you've already proven and just refresh the optics. For varifocal wearers in particular, where lens position matters a great deal, sticking with a familiar frame removes a lot of the guesswork.
Less waste, without the lecture
There's a sustainability angle here too, and it's a genuine one rather than a marketing line. Spectacle frames are made from acetate, metal alloys, and assorted small fittings, none of which break down quickly in landfill. Every pair you keep in use is one that doesn't get binned. You don't have to be especially green to appreciate not throwing away a perfectly good frame just because the lenses changed.
When reglazing might not be worth it
A good optician will tell you when reglazing isn't the smart move, so it's worth being honest about the limits.
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Older acetate frames can become brittle. Plastic frames stiffen with age, and a brittle frame can crack when the old lenses are pushed out. If a frame is many years old, there's a small risk it won't survive the process.
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Rimless and semi-rimless frames carry more risk. These hold the lenses with drilled holes or fine nylon cord rather than a full rim. They can be reglazed, but they're more delicate and not every old pair will take new lenses cleanly.
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Very curved wrap frames can struggle with strong prescriptions. The steep curve on sporty wraparound styles doesn't always pair well with high prescriptions, which can limit what lenses will sit correctly.
In those cases, a reputable service will flag the risk before doing anything rather than quietly proceeding. If your frame is genuinely on its last legs, replacing it may be the better call.
Getting a reglaze right
A reglaze services is only as good as the information behind it. Two things make the biggest difference. First, an accurate, up-to-date prescription, ideally less than two years old, including your pupillary distance (PD), which tells the lab where to centre the lenses. Without the PD, varifocals and stronger prescriptions can feel off. Second, choosing the right lens for how you live: an anti-reflective coating if you drive at night, a photochromic lens if you don't want to carry sunglasses, or a higher index lens to keep a strong prescription looking slim. Spend a moment on those choices and the finished glasses will often feel better than the originals.
The takeaway
Buying a brand new pair every time your eyes change is an expensive habit, and a lot of it is spent on a frame you didn't need to replace. Reglazing turns that around. You keep the frame that already fits and suits you, you only pay for the lenses, and you keep a usable pair out of the bin in the process. It won't suit a frame that's falling apart, and it's worth being upfront about the rare cases where it isn't the answer. But for most people, with a frame in decent condition and a current prescription, it's quietly the better-value choice, and one the high street tends to skip over.
FAQs
How much can I save by reglazing instead of buying new?
It depends on your frame and lens choice, but because you're not paying for a new frame, reglazing is usually significantly cheaper than a complete pair, particularly if your original frames were designer or premium.
Can any frame be reglazed?
Most can, including full-rim, semi-rimless and rimless. The exceptions are frames that have become brittle with age or unusual wrap shapes paired with very strong prescriptions. A good service will check the frame's condition first.
Do I need a new eye test before reglazing?
You need a valid prescription, ideally one taken within the last two years. If yours is older or your vision has changed, get a fresh test so the new lenses are accurate.
What is a PD and why does it matter?
PD is your pupillary distance, the gap between the centres of your pupils. It tells the lab where to position the optical centre of each lens. It matters most for varifocals and stronger prescriptions, so it's worth having on hand.
Can I add coatings or upgrade my lenses during a reglaze?
Yes. A reglaze is a good moment to add an anti-reflective coating, switch to photochromic lenses, or move to a thinner high index lens, even if your original glasses didn't have them.