Common home remedies such as toothpaste, bicarbonate of soda and polishing products are not a reliable way to remove scratches from glasses lenses. They may damage the lens surface or its outer coatings and add new fine scratches.
If a scratch begins to affect visual clarity, having the lens assessed by an optician and replacing it if necessary is safer than trying to polish it with abrasive materials. A small scratch can become a persistent nuisance for people who wear glasses every day, particularly when it lies within the field of vision or scatters light and creates unwanted reflections.
As it is noticed repeatedly, the mark may appear more obvious, prompting the wearer to try quick fixes promoted as being able to restore lens clarity within minutes. But modern lenses, despite their durable appearance, are not scratch-proof.
Why are plastic lenses easily scratched?
Most glasses now use lightweight plastic lenses because they are safer to wear than traditional glass, but they remain more prone to scratching than glass lenses. The problem is not limited to the lens material; it also involves how the lenses are used and cleaned each day. Dust and dirt particles on the lens surface can directly cause scratches when the lens is wiped before they are removed.
Practices that may damage lenses include cleaning them with a shirt, paper tissues or towels, as well as wiping them while they are dry and covered in dust. Rather than removing the particles, friction moves them across the surface and creates fine scratches that can accumulate over time.
Toothpaste and bicarbonate of soda may damage coatings
The idea of using toothpaste or bicarbonate of soda is based on the assumption that an abrasive material can smooth the lens surface when the scratch is minor, making the mark less visible. But this overlooks the fact that modern lenses may have delicate coatings and treatments, including anti-reflective coatings, scratch-resistant layers and ultraviolet-protection treatments.
Rubbing a lens with an abrasive material does not actually repair the scratch; it may remove part of the surface or affect its coatings. Rubbing can also create fine scratches around the original mark. The scratch may initially appear less visible, but this can later be accompanied by blurred vision, bothersome reflections or permanent coating damage that is difficult to repair.
When can you live with a scratch?
The appearance of a scratch does not mean that the glasses are no longer fit for use. The decision depends on the mark’s size and location and how much it affects vision. If the scratch is small, lies at the edge of the lens outside the field of vision, and causes no blurring or bothersome reflections, it may be possible to live with it, while avoiding any attempt to polish or treat it with household materials.
A scratch in the centre of the lens, or one that reduces visual clarity, may be more bothersome when exposed to bright light or while driving at night. In such cases, the focus should not be on concealing the mark by any available means, but on having the lens examined by an optician to assess its condition and determine whether the damage requires replacement.
Replacing the lens becomes more likely when the scratch is deep or spread across more than one area, as there is no reliable home method to restore it to its original condition. Attempts to polish it may worsen the damage by creating additional scratches or damaging the outer coatings, particularly the anti-reflective coating, which can be affected by abrasive materials and friction.
Products that claim to conceal scratches may temporarily improve the lens’s appearance without treating the damage itself, and may leave residue or an unwanted layer on the surface. When scratches begin to reduce visual clarity or cause eye strain, replacing the lenses may be safer and more sensible in the long term than spending time and money on temporary fixes that could make the problem more complicated.
Cleaning and storage habits reduce new scratches
Prevention remains the best way to deal with scratched glasses. Habits that increase the risk of damage include placing the glasses with the lenses directly touching a table or another surface, or leaving them in the same bag as keys and small items. Cleaning them with a shirt or a cloth not intended for lenses can also create friction that damages the surface.
To clean glasses in a way that reduces the risk of scratching, first rinse the lenses with lukewarm water to remove dust and loose particles, then use a glasses cleaner or suitable mild soap. Dry the lenses with a clean microfibre cloth instead of paper tissues, towels or clothing, which may move dirt across the surface.
It is also preferable to keep the glasses in a hard case when they are not being worn, preventing contact with keys and other objects and protecting them from knocks. Avoid wiping the lenses when they are dry if dust is visible on them, as passing a cloth over those particles can turn the cleaning process itself into a cause of fine scratches.
If the lenses are repeatedly scratched because of the nature of the work or pattern of use, choosing a suitable type may be more useful than later looking for ways to conceal the damage. Plastic lenses with scratch-resistant coatings are available and can withstand friction and daily use for longer, but they are not completely scratch-proof.
The use of glass lenses can also be discussed with an optometrist, as they are generally more resistant to scratches than plastic types. But this feature comes with important drawbacks: glass is heavier and more liable to break, so it may not suit daily use or people whose glasses are more likely to be dropped or knocked.
Scratch resistance should therefore not be the only criterion when choosing a lens. The most suitable choice requires balancing surface resistance, lens weight, durability and the level of safety it provides, along with how the glasses are used each day.
If the scratch remains minor and does not affect vision, leaving it unpolished is better than exposing the lens to abrasive materials. Replacement is more advisable when visual clarity declines or eye strain appears.
