Blurred vision, squinting, headaches or difficulty focusing can mean your glasses prescription needs to be reviewed, but these symptoms do not prove that an old prescription is the cause. Dry eye, cataract, migraine, glaucoma, retinal problems, medicines and other eye or medical conditions can cause similar symptoms.
If your vision has changed or your glasses are not helping as much as they used to, arrange an eye examination. An optometrist can check whether the prescription has changed and assess your eye health at the same visit.
Quick Answer: When Should You Have Your Glasses Prescription Checked?
- Your distance or near vision is persistently blurred.
- You are squinting or changing how far away you hold reading material.
- You develop recurring headaches or eye strain during visual tasks.
- Your current glasses no longer feel as clear or comfortable as they used to.
- You find night driving or low-light vision noticeably harder.
- You notice new ghosting, double vision, halos or other changes in visual quality.
- Your visual needs have changed, especially for reading, screens or close work.
These are reasons to have your vision assessed, not a checklist that can confirm you need a new prescription.
HAS YOUR VISION CHANGED?
Noticing changes with your current glasses?
If your vision has changed or your glasses are not helping as much as they used to, an eye examination can check your prescription and assess your eye health.
Find an Optometrist1. Your Vision Is Persistently Blurry
A change in refractive error can cause blurred vision, and new glasses or contact lenses may help when the blur is caused by short-sightedness, long-sightedness, astigmatism or presbyopia.
However, Healthdirect notes that blurred vision can also occur with dry eye, cataract, glaucoma, macular degeneration, eye infection, retinal disease, diabetes, migraine and some medicines. That is why persistent blur should be assessed rather than treated as proof that you only need stronger glasses.
When blurred vision needs urgent care
Sudden blurred vision, sudden vision loss or a sudden marked change in eyesight needs urgent medical assessment. Call triple zero (000) if sudden visual symptoms occur with facial droop, weakness or numbness, loss of balance or slurred speech.
2. You Are Squinting More Often
Squinting can temporarily change how light enters the eye and may make blurred detail seem a little clearer. It can occur when a refractive error is not fully corrected.
Squinting is not specific to one prescription problem, so an eye test is the appropriate way to determine whether your glasses need changing.
3. You Get Headaches or Eye Strain During Visual Tasks
Headaches and tired, sore eyes can occur when your vision correction no longer suits a task, particularly during prolonged reading, screen work or other near activities.
Healthdirect also notes that eye strain can have several contributing factors, including prolonged near work and unsuitable glasses or contact lenses. Headaches themselves have many non-eye causes, so recurring headaches should not automatically be attributed to your prescription.
If symptoms mainly occur with prolonged screen use, see Digital Eye Strain Symptoms in Australia.
4. Your Current Glasses Do Not Help as Much as They Used To
This is one of the more direct reasons to arrange an eye check. Healthdirect specifically recommends an eye examination when your glasses are no longer helping as much as they used to.
The cause may be a prescription change, but lens scratches, frame fit, dry eye or another eye-health issue can also affect how clearly or comfortably you see.
5. Near Work Is Becoming Harder
If you are holding your phone, book or menu farther away, struggling with fine print or getting tired quickly while reading, presbyopia may be contributing.
Presbyopia is the normal age-related loss of near focusing ability and commonly becomes noticeable from around age 40. It can be managed with reading glasses, multifocal or progressive lenses, contact lenses or other options depending on the person.
If you are considering multi-distance lenses, see Progressive Lenses in Australia for a separate explanation of benefits, limitations and fitting.
6. Night Driving or Low-Light Vision Is Getting Harder
Difficulty seeing road signs, increased glare or halos around lights can occur with refractive error, including astigmatism, but these symptoms can also occur with cataract, glaucoma and other eye conditions.
Do not assume that an anti-reflective coating or a stronger prescription will solve new night-vision problems. Have the underlying cause checked first, especially if the change is recent or getting worse.
For more about astigmatism and night-vision symptoms, see Astigmatism: Symptoms, Causes, Eye Tests and Correction Options.
7. You Notice Ghosting, Double Vision or a New Change in Visual Quality
Ghosting or a faint second outline can sometimes occur with uncorrected astigmatism or other optical causes, but true double vision has a wider range of possible causes and should not be dismissed as an outdated prescription.
Arrange an assessment if double vision is new, persistent or recurring. Seek urgent medical care if it starts suddenly with severe headache, weakness, numbness, balance problems, speech difficulty or after a head injury.
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Start Free Checklist TestSymptoms That Do Not Necessarily Mean You Need New Glasses
Several common symptoms can overlap with prescription changes but may come from other problems.
| Symptom | Other possible explanations |
|---|---|
| Dry, gritty or burning eyes | Dry eye, contact-lens irritation, reduced blinking or environmental factors |
| Headaches | Migraine, tension headache, illness, medication effects and many other causes |
| Halos around lights | Astigmatism, cataract, corneal problems or glaucoma, among other causes |
| Blurred vision | Dry eye, cataract, retinal disease, diabetes, migraine, medicines and refractive error |
| Eye fatigue | Digital eye strain, dry eye, prolonged near work, binocular or focusing issues, or unsuitable vision correction |
What About Scratched or Damaged Lenses?
Scratches, damaged coatings, loose frames or poor alignment can make glasses uncomfortable or reduce visual quality even if the prescription itself has not changed.
If the lenses are badly scratched or the frame no longer sits correctly, have the glasses inspected. You may need replacement lenses, frame adjustment or a new pair even if the prescription is still suitable.
How Often Should You Have Your Prescription Checked?
There is no single interval that applies to everyone. Healthdirect advises regular eye tests and says people aged 40 years and over should generally have an eye test every 2 to 3 years, with more frequent checks when symptoms, age or health risks make this appropriate.
Do not wait for the next routine interval if your vision changes, your glasses stop working as well, or you develop new eye symptoms.
For a fuller explanation of what happens during an examination, see Eye Test in Australia: What to Expect.
What Happens When Your Prescription Is Rechecked?
An optometrist will usually check how clearly you see and use refraction testing to determine whether a different prescription improves your vision. They may also examine the health of the eyes and use additional tests when clinically appropriate.
The result may be a new prescription, no prescription change, advice about dry eye or screen habits, monitoring of an eye-health finding, or referral for further assessment.
When Vision Changes Need Prompt or Urgent Care
- Sudden vision loss or a sudden marked change in vision.
- New flashes of light or a sudden increase in floaters.
- A new shadow or curtain across part of your vision.
- Severe eye pain.
- A painful red eye or marked sensitivity to light.
- Sudden blurred or double vision with weakness, numbness, facial droop, loss of balance or speech difficulty.
- Vision changes after a significant eye or head injury.
WHEN YOUR VISION CHANGES
Think Your Glasses May Need Checking?
If your vision has changed or your glasses are no longer helping as much as they used to, an eye examination can check your prescription and assess your eye health.
Find an OptometristFrequently Asked Questions
How do I know if I need a new glasses prescription?
You cannot confirm it from symptoms alone. Persistent blur, squinting, headaches, near-vision difficulty or glasses that no longer help are good reasons to have your prescription and eye health checked.
Can an old glasses prescription cause headaches?
An unsuitable prescription can contribute to eye strain and headaches, but headaches have many possible causes. Recurring or severe headaches should not be assumed to be caused by glasses.
Can your prescription change even if your vision still seems fairly clear?
Yes. Small changes may be noticeable only during particular tasks or at night. An eye test can determine whether the prescription has changed enough to affect comfort or clarity.
Why am I holding my phone farther away to read?
This is a common sign of presbyopia, the age-related reduction in near focusing ability that often becomes noticeable from around age 40.
Does blurry vision always mean I need stronger glasses?
No. Refractive error is one possible cause, but dry eye, cataract, glaucoma, retinal problems, diabetes, migraine and some medicines can also blur vision.
Can an old prescription permanently damage my eyes?
In adults, an outdated prescription usually causes reduced clarity or discomfort rather than permanent structural eye damage. The important issue is that new symptoms can also come from eye disease, so changes should be assessed.
Do I need a new prescription if night driving is harder?
Possibly, but night-vision problems can also come from astigmatism, cataract, glaucoma or other causes. An eye examination is the safest way to determine why night vision has changed.
How long should it take to adapt to new glasses?
Some people adapt quickly, while others need more time, especially after a larger prescription or lens-design change. If significant blur, distortion, headaches or dizziness persist, contact the dispensing practice for a review.
Can I keep my old frames and replace only the lenses?
Often, yes, if the frame is structurally sound and suitable for re-lensing. The practice should inspect the frame before accepting the job.