Photochromic Lenses vs Separate Sunglasses: Which Makes More Sense for You?
21 July 2026
16:47
Your prescription has changed. Your lenses are scratched. But are your frames? Perfect. You love them – the shape suits your face; they sit comfortably, and frankly, you spend good money on them. So, the question is natural: can you simply put new lenses in your old frames?
The short answer is yes – in many cases, reglazing your glasses is entirely possible and genuinely worth considering. But the longer, more useful answer is it depends on your frames, your prescription, and the type of lenses you need. Get that decision right and you save money, keep the glasses you love, and end up with a result every bit as good as buying new. Get it wrong – especially with varifocals – and you can end up with lenses that never quite work as they should.
At Mosspark Opticians in Bellahouston, Glasgow, this is a conversation Rahillah has regularly with patients – and after nearly 20 years of clinical experience, she has seen reglazing done brilliantly and, regrettably, done badly. This guide covers what every patient in Glasgow should know before making the decision.
Reglazing is the technical process of removing existing lenses from a frame and replacing them with a new set of lenses tailored to your latest prescription. This is a popular service for patients who have invested in high-quality, independent eyewear and wish to extend the life of their frames.
For many of our patients, a pair of glasses is more than just a tool for sight; it’s a part of their identity. There are several reasons why you might want to keep your current frames:
Clinical Insight from Rahillah Moghul: “In my 20 years of practice, I have seen many patients deeply attached to their frames.” However, the most important question isn’t just ‘can we do it?’ But should we do it? A lens is a medical device, and it needs a stable ‘home’ to work correctly.”
Not sure whether your frames are suitable?
Book a quick assessment with our team - GOC-registered, independent, and always honest about what's worth doing.
Getting new lenses fitted into your existing frames is simpler than most people expect. Here is how the process works at Mosspark Opticians.
1. Book an eye examination
Start with a current, valid prescription. If yours is more than two years old, or your vision has changed, book an eye exam first. At Mosspark, adult appointments run for 40 minutes – long enough to check your prescription properly and assess the overall health of your eyes. We accept both NHS and private patients.
2. Bring your frames in for assessment
Before anything else, we assess your frames in person. Clean them gently with a microfiber cloth beforehand, so the material is easy to inspect. We check for stress fractures, hinge conditions, any warping, and whether the frame dimensions are suitable for your prescription – especially important for varifocal lenses.
3. Get your measurements taken
With your frames sitting naturally on your face, we take the measurements needed to center your lenses correctly – pupillary distance for single vision lenses, and fitting height for varifocals. This step cannot be done remotely, which is why in-person fitting consistently produces better results.
4. Choose the type of lenses you want
Now it is time to select your lenses. We offer single vision, bifocal, and varifocal lenses, alongside high index, photochromic, blue light filter, and anti-reflection options. If you are looking for something more specific, we have a full range of options to suit your needs and lifestyle.
5. We send your frames to the laboratory
Once your lenses are chosen and your measurements are confirmed, we handle everything from here. Your frames go directly to our optical laboratory – no posting required on your part.
6. Collect your glasses and get a final fitting check
Your reglazed glasses are typically ready within 5 to 10 working days. Collect them in person so we can confirm if the fit is right and make any adjustments needed before you leave.
While we love helping patients save their favorite pairs, there are times when we will recommend a fresh start:
1. The “Styling” Shift
Styles change. What suited you three years ago might not match your current hair colour or lifestyle. Our Eyewear Styling Consultation is designed to help you find a frame that empowers you today.
2. Lens Technology Advances
We partner with Japanese and British manufacturers (like Hoya and Nikon) who produce state-of-the-art lenses with superior coatings. These lenses often perform best in a frame specifically measured for their unique optical profile.
3. The “Hidden” Cost
If a frame is on its last legs, you might pay for new lenses only for the frame to break a month later. In these cases, savings become a loss.
Yes – and this is something more patients should know about. If you have a pair of sunglasses frames you love (prescription or otherwise), reglazing them with tinted prescription lenses, polarised lenses, or photochromic lenses is entirely possible – provided the frames meet the same condition criteria as regular glasses.
This is particularly popular with patients who have designer sunglasses frames that are no longer available, or sports frames they have used for years and don’t want to replace. Polarised lenses for driving are a common upgrade, as are mirror-finish tints for specific sports activities.
At Mosspark we also fit prescription sports lenses – so if you have a wrap-style sports frame and need clear optical performance at the same time, that is a conversation worth having rather than assuming it cannot be done.
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Feature
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Reglazing Old Frames
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Buying New Frames
|
|---|---|---|
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Average Cost
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Lower (Pay only for lenses/lab fee)
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Higher (Pay for frame + lenses)
|
|
Wait Time
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7-10 working days (varies)
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Same (often quicker for stock frames)
|
|
Risk
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Small risk of frame breakage
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Zero risk; full manufacturer warranty
|
|
Sustainability
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High (Reuse existing materials)
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Low (New manufacturing required)
|
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Clinical Accuracy
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Dependent on frame stability
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Guaranteed (New measurements taken)
|
Before committing to reglazing, there are a few important factors worth checking. Getting this right from the start saves time, money, and frustration later.
1. Frame Material
Your frames need to be structurally sound before new lenses can be safely fitted. Cracked acetate, warped arms, or a frame that has lost its shape are all red flags. A damaged frame will not hold new lenses securely – and the stress of the fitting process can worsen existing damage significantly. Bring your frames in and we will assess them honestly before you commit to anything.
2. Lens Material
Not every lens material suits every frame. Thicker frames generally accommodate a wider range of lens types, while very fine or delicate frames may not support high index lenses without putting undue pressure on the frame of grooves or nose pads. We check compatibility before ordering, so there are no unwelcome surprises at collection.
3. Frame integrity – hinges, screws, and edges
Loose hinges, missing screws, or worn barrel fittings are worth addressing before reglazing. If the frame cannot hold itself together reliably, new lenses will not resolve that. In some cases, minor frame repairs are straightforward. In others, new frames are the more sensible investment.
4. Prescription accuracy
Always confirm your prescription is current before reglazing. A prescription more than two years old may no longer reflect your vision accurately – meaning new lenses ground to outdated measurements will not correct your sight properly. If you are unsure, book an eye examination first.
5. Your eye health
A change in vision is sometimes a symptom of an underlying health condition rather than simple refractive change. Before having new lenses made, it is worth having your eyes examined properly – not just your prescription checked. At Mosspark, our 40-minute examinations assess the health of your retina, optic nerve, and ocular surface alongside your prescription, giving you a complete picture before any lens decision is made.
Reglazing is almost always cheaper than buying a completely new pair of glasses – and that cost difference can be substantial, depending on your prescription and the lens options you choose.
At the budget end, basic single vision lenses in existing frames from an online postal service can start from as little as £10 to £30. These are entry-level lens materials with minimal coatings, and they serve as a purpose for straightforward, low-powered prescriptions in robust frames.
When you choose to reglaze with us, you are not just getting “standard” glass. We partner with renowned manufacturers to provide the thinnest, clearest, and most durable lenses available.
For those with stronger prescriptions, we offer high-index materials that reduce the “magnification” look of the eyes and ensure the lenses sit flush within your old frames. These are essential for patients who want to maintain the aesthetic of slim, independent eyewear.
Reglazing is the perfect time to upgrade your lens technology. We can add:
1. Expert Eye Care You Can Trust
Mosspark Opticians is more than just a shop; we are a dedicated health centre for your eyes. We use advanced technology, like OCT 3D eye scans, to look deep into your eyes. This helps us find potential health issues long before you notice any changes in your vision. When you reglaze with us, you are also getting a thorough health checkup.
2. The Benefit of Longer Appointments
We provide 30 to 45-minute appointments because we believe you shouldn’t be rushed. This extra time allows us to talk about your lifestyle, like your hobbies, and how much time you spend on screens. We also take the time to explain your results clearly, so you understand exactly how to look after your eye health.
3. Stress-Free Style Advice
Many people find picking new glasses stressful because there are too many choices. Our styling service turns this into a fun and exciting experience. We focus on high-quality frames from independent designers that offer a better fit and more unique style than the big high-street chains.
4. Part of the Local Community
We are proud to serve the diverse community of Glasgow Southside. Because we speak English, Urdu, and Punjabi, we can communicate clearly with all our patients. This helps us provide more accurate prescriptions and better advice. As a local, family-run business, we value personal care and long-term relationships.
Our state-of-the-art lens portfolio covers everything you might need:
Putting new lenses in your old frames is a fantastic option if your current glasses are in excellent physical condition, and you aren’t looking for a style change.
However, if your frames are more than two or three years old, they may have “hidden” weaknesses that make new frames a safer long-term investment.
Book Your Appointment or call us on +44 141 427 4040
Independent Optician – Mosspark Opticians, Glasgow
Rahillah is a fully qualified optician with nearly 20 years of experience providing professional eye care in Glasgow. As the owner of Mosspark Opticians, she specialises in comprehensive eye examinations, prescription glasses, children’s eyewear, and personalised optical solutions. Known for a patient-focused approach, Rahillah is committed to clear communication, clinical excellence, and long-term eye health for patients of all ages.
No reglazing will affect the fit of your glasses. But in case your frames are not fitting well, there might be a slight difference with the new lenses. You can discuss the issue with a professional optician.
Yes, this is not an issue. You can easily opt for different lenses for each eye, depending on your prescription.
Once your glasses are reglazed, it’s important to continue their proper care. Clean your lenses regularly with a microfibre cloth and lens cleaner. Avoid harsh chemicals or wiping lenses with clothes, which can scratch them.
Yes, in most cases you can. Provided your frames are in sound structural condition - no stress fractures, intact hinges, no significant warping - new lenses can be fitted to your existing frames. The process is called reglazing. Single vision lenses are the most straightforward; varifocals require more careful assessment.
Basic single vision reglazing starts from around £40-£70 at a quality independent optician. Varifocal reglazing typically costs £90-£300 depending on the lens design. Very cheap online options exist from around £10, but these carry fitting risks, particularly for varifocal wearers.
Yes, but this requires an in-person fitting measurement called the fitting height, which postal reglazing services cannot take. Without this measurement, the reading zone of the varifocal may be positioned incorrectly, causing eye strain and adaptation problems. Always have varifocal reglazing done in person at a GOC-registered practice.
Frames with visible stress fractures, warped arms, stripped screws, or worn hinges are poor candidates. Very small frames (fitting height below 28-30mm) are generally not suitable for varifocal lenses. Some rimless and semi-rimless designs may require extra assessment before proceeding.
Single vision reglazing typically takes 5-7 working days. Varifocal or specialist lenses may take 7-10 working days. Some practices offer faster turnarounds for straightforward prescriptions.
Yes. Prescription, polarised, tinted, or photochromic lenses can be fitted to most sunglasses in good condition. This is a cost-effective option for patients with designers or sports frames they wish to keep.
NHS optical vouchers in Scotland can be used towards the cost of prescription lenses, including in some reglazing scenarios. Eligibility depends on your individual circumstances. Speak to a GOC-registered optician who accepts NHS patients - such as Mosspark Opticians in Glasgow - to confirm what applies to your situation.
It depends on your frames, prescriptions, and budget. If your frames are in excellent condition and your prescription change is modest, reglazing is often the smarter choice - financially and practically. If your frames show wear, your prescription has changed significantly, or you are moving to varifocals for the first time, new frames may serve you better.
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