Night Driving and Winter Glare: Why Your Eyes Struggle From October Onwards
16 September 2026
12:05
It is one of the most common questions we get, and it is almost always the same situation. You have had the same frames for years, you like them, they suit you, and nothing in the shop looks as good. Your prescription has changed. Can you just put new lenses in these?
The honest answer is: usually yes, sometimes no, and there is a risk involved that you should understand before you hand them over. Here is the full version, including the parts an optician has a commercial reason not to tell you.
Frame type | Reglazing outlook | What to know |
|---|---|---|
Full-rim acetate, good condition | Usually straightforward | Needs heating; small risk of cracking if brittle |
Full-rim metal, good condition | Usually straightforward | Check screw threads and rim wire condition |
Semi-rimless (nylon cord) | Possible, moderate risk | Groove must be cut precisely; cord may need replacing |
Rimless (drilled) | Higher risk | New holes in new lenses; mount may not survive |
Frame over roughly five years old | Assess individually | Acetate dries out and becomes brittle with age |
Frame with existing crack or repair | Not advisable | It will almost certainly fail during glazing |
Designer frame, discontinued | Often worth it | The reason most people ask in the first place |
The single biggest factor is not the frame type. It is age and condition. A five-year-old acetate frame that has lived in a car in Glasgow winters is a different proposition from the same frame kept in a case.
Worth understanding, because it explains where the risk comes from.
The new lenses are cut and edged to match the shape of your frame, then fitted. For a plastic frame, that means heating it until it flexes enough to accept the lens, and heating is the moment of danger. Acetate dries out over years; an older frame can become brittle without looking any different from the outside. It goes into the heat looking fine and comes out with a hairline crack.
For rimless frames the lenses are drilled and mounted directly, which means new holes in new lenses and reusing mounting hardware that has already been through this once. For semi-rimless, a groove is cut around the lens edge to take a nylon cord, and that groove has to be exactly right.
No optician can guarantee an old frame against breakage during reglazing. Anyone who does is either not being straight with you or is quietly pricing the risk into the job. We will tell you our honest assessment before starting, and it is your decision from there.
There are situations where we would advise against it, and we would rather lose the job than do it.
This deserves its own section because the internet is full of bad advice about it.
Scratched lenses cannot be repaired. Not with toothpaste, not with car polish, not with baking soda, not with any of the home remedies that circulate. Modern lenses carry anti-reflective and hard coatings, and every one of those methods works by abrading the surface — which means it removes coating rather than removing the scratch. The lens ends up hazier than it started.
If your lenses are scratched, the options are to live with them or to replace them. Our article on removing scratches from glasses goes through what does and does not work.
Prevention is more useful. Most scratches come from three habits: putting glasses down lens-first, cleaning them dry or on a shirt, and keeping them loose in a bag. Cleaning properly is genuinely the main one, and we have covered the method in how to clean glasses properly.
Entirely fine, and we would rather say so plainly than leave people wondering.
Your prescription belongs to you and you can have glasses made wherever you like. If you bought frames online or from another practice and want them reglazed here, bring them in. We will assess the frame honestly, tell you whether we think it will survive, and quote for the work.
The same applies to adjustments. If your glasses are uncomfortable and you did not buy them from us, we will still adjust them.
Sometimes the economics do not work, and it is worth being candid about it.
If the frame is old, the prescription has changed substantially, and the lenses need to be a premium design, you can end up paying a significant amount to put expensive new lenses into a frame that may fail and has limited life left regardless. At that point, new frames with the same lenses is often the more sensible purchase.
We will tell you when we think that is the case. If you want to proceed anyway because you love the frames, that is a perfectly legitimate reason and we will do the work. Our frame range and the brands we stock are deliberately curated rather than vast, and there is a free styling consultation if you would rather have help choosing.
If you want to understand the numbers on your prescription before you come in, understanding your glasses prescription breaks it down.
Book your comprehensive eye examination or eyewear styling consultation with
Mosspark Opticians today.
Usually yes. The limiting factor is the condition of the frame rather than the lenses. Plastic frames must be heated to accept new lenses, and older acetate becomes brittle with age, so there is a genuine risk of breakage. Rimless and semi-rimless frames carry more risk than full-rim. We assess the frame and give you an honest view before starting.
They might, and no optician can guarantee otherwise. The risk rises with the age of the frame, previous repairs, and rimless or semi-rimless construction. A frame that already has a crack or a soldered joint is very unlikely to survive. We will tell you what we think before we begin, and the decision is yours.
No. Scratched lenses cannot be repaired. Home remedies such as toothpaste, car polish or baking soda all work by abrading the surface, which removes the anti-reflective and hard coatings rather than the scratch, leaving the lens hazier than before. The only real options are to live with it or replace the lenses.
Yes. Your prescription belongs to you and you can have glasses made anywhere. Bring in frames bought online or from another practice and we will assess them honestly, tell you whether we expect them to survive the process, and quote for the work. The same applies to adjustments.
No. Varifocals need vertical depth in the lens to accommodate the distance, intermediate and reading zones. A shallow frame that worked perfectly well for single vision lenses may leave no usable reading area at all. This is one of the most common reasons we advise against reglazing an existing frame.
Three habits account for most scratches: putting glasses down lens-first, cleaning them dry or on a shirt, and carrying them loose in a bag. Clean them with warm water and a little washing-up liquid, dry with a proper microfibre cloth, and use a case. Prevention is the only effective approach, since scratches cannot be undone.
Often yes, and it is the most common reason people ask. If the frame is discontinued, suits you well and is in sound condition, reglazing keeps something you cannot replace. Weigh it against the frame’s age and whether your prescription has changed enough to need a lens the frame cannot carry well.
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