Knowing when to replace your lenses can save you from eye strain, headaches, and deteriorating vision. Whether your prescription has changed or your lenses are simply showing their age, this guide helps you recognise the signs that it's time for new lenses — and explains why reglazing is often the most sensible option.
1. Your Prescription Has Changed
The most common reason to replace your lenses is a change in your prescription. Your eyesight can change gradually over time, and wearing an out-of-date prescription can cause eye strain, headaches, and blurred vision. As a general rule, adults should have an eye test every two years — or more frequently if recommended by their optician. If your optician has issued a new prescription, it's time for new lenses.
The good news is that if you still love your frames, you don't need to replace them. Simply reglaze your existing frames with lenses cut to your new prescription.
2. Your Lenses Are Scratched
Scratches on lenses are more than just cosmetic. Even minor scratches can scatter light and reduce optical clarity, causing glare and making it harder to see clearly — particularly when driving at night. If your lenses have visible scratches that affect your vision, it's time to replace them. A scratch-resistant coating on your new lenses can help prevent this happening again.
3. Your Lenses Are Chipped or Cracked
A chipped or cracked lens should be replaced as soon as possible. Structural damage compromises the integrity of the lens and can be a safety risk. Even a small chip at the edge of a lens can cause it to shatter more easily under impact.
4. Your Anti-Reflective Coating Is Peeling or Crazing
Anti-reflective (AR) coatings can degrade over time, particularly if lenses are cleaned with harsh chemicals or abrasive cloths. When the coating starts to craze (develop a network of fine cracks) or peel, it creates distracting visual interference and cannot be repaired. Replacement is the only solution.
5. You're Experiencing Persistent Eye Strain or Headaches
If you're regularly experiencing headaches, tired eyes, or difficulty focusing — especially after screen use — your lenses may no longer be meeting your visual needs. This could indicate a prescription change, or it may be worth considering lenses with a blue light filter if you spend long hours in front of screens.
6. Your Lifestyle Has Changed
A change in lifestyle or occupation can mean your current lenses are no longer the best fit. For example, if you've started working from home and spend more time at a computer, you might benefit from varifocal lenses that handle near, intermediate, and distance vision seamlessly. Browse our Varifocal Lens Options to find the right solution.
7. Your Lenses Are More Than Two Years Old
Even if your prescription hasn't changed dramatically, lenses that are two or more years old may have accumulated enough wear to affect your vision. Coatings degrade, materials can yellow slightly, and minor prescription drift can add up. An eye test will confirm whether new lenses are needed.
How Often Should You Replace Your Lenses?
There's no fixed rule, but most opticians recommend reviewing your lenses every one to two years alongside your regular eye test. If you notice any of the signs above before then, don't wait — replacing your lenses promptly protects your eye health and your quality of vision.
Replace Your Lenses Without Replacing Your Frames
If your frames are still in good condition, there's no need to buy a completely new pair of glasses. Reglazing lets you keep the frames you love and simply fit new lenses. It's faster, more affordable, and more sustainable. Explore our full range of single vision and varifocal lens options to get started.