If you’ve had an eye test recently and are wondering whether your prescription is still valid, or if you’ve found an old prescription and aren’t sure whether you can use it, this guide explains how prescription validity works in the UK.
The Standard Rule: Two Years for Adults
In the UK, a glasses prescription is typically valid for two years from the date of issue for adults. This means you can use the same prescription to order glasses at any point within that two-year window — whether from a high street optician, an online retailer, or anywhere else.
The two-year period isn’t arbitrary. It reflects how frequently vision tends to change in healthy adults. Regular eye tests allow an optometrist to check not only whether your prescription has changed, but also to examine the overall health of your eyes — detecting early signs of conditions such as glaucoma, cataracts, diabetic retinopathy, and macular degeneration. Many of these conditions can be treated effectively if caught early, which is why regular testing matters even if your vision feels the same.
When Prescriptions May Be Shorter Than Two Years
There are circumstances in which an optometrist may specify a shorter validity period — typically one year. Your prescription may have a shorter validity if:
- Your vision is changing rapidly (common in children, teenagers, and some adults with progressive myopia)
- You have a health condition that affects eye health — such as diabetes, which can cause changes to the lens of the eye
- You have glaucoma or are at risk of glaucoma, where more frequent monitoring is clinically necessary
- Your optometrist has noted any other findings that warrant closer review
If your prescription is issued with a shorter validity period, this should be noted on the prescription itself. If it isn’t clear, you can ask your optometrist when they recommend your next test.
Children’s Prescriptions
Children’s vision can change more rapidly than adults’, particularly during periods of growth. Prescriptions for children are often issued for one year rather than two, and regular eye tests are recommended throughout childhood and adolescence. If your child is prescribed glasses, check the validity date on their prescription before ordering.
How to Check Whether Your Prescription Is Still Valid
Your prescription will have a date of issue on it. Count two years forward from that date — if today’s date is within that window, the prescription is still valid (unless a shorter period has been specified). The validity date may also be written explicitly on the prescription itself.
If you cannot find your prescription, contact the optician who carried out your most recent eye test. They are required to keep records of eye tests and prescriptions and should be able to provide a copy, though some practices charge a small administrative fee.
Can You Use an Expired Prescription?
No. Once a prescription has expired, it cannot be used to order glasses from any UK optical retailer. This rule exists to protect patients: an outdated prescription may no longer accurately reflect your current vision needs, and wearing glasses with an incorrect prescription can cause eye strain, headaches, and discomfort — and in some cases may affect your ability to drive safely.
If your prescription has expired, you’ll need a new eye test before ordering. A private eye test typically costs £20–£30 at a high street optician. You may be entitled to an NHS-funded eye test depending on your age, medical history, or financial circumstances — the full eligibility criteria are available at nhs.uk.
How Often Should You Have an Eye Test?
Most adults are recommended to have an eye test at least every two years, which aligns with the standard prescription validity period. However, your optometrist may recommend more frequent tests based on your age, health, or the findings from your previous test.
The General Optical Council, which regulates optical professionals in the UK, advises that eye tests are an important part of general health care — not only for updating your glasses prescription, but for monitoring eye health and detecting early signs of systemic disease.
Adults over 60 are generally advised to have a test every year. The Association of British Dispensing Opticians (ABDO) recommends that adults of all ages with a history of eye disease, diabetes, or a family history of conditions such as glaucoma discuss their testing frequency with their optometrist directly.
Ordering Glasses Before Your Prescription Expires
You don’t need to wait until your prescription expires to order a new pair of glasses. You can order at any point while your prescription is valid — whether you want a second pair, a backup, or an update to a different frame style.
If you’re wondering what your prescription values mean before entering them at checkout, see our guide on how to read your glasses prescription.
You’ll also need your Pupillary Distance (PD) measurement when ordering online. Our guide to what PD is and why it matters explains how to get this figure if it isn’t on your prescription.
Browse the full glasses range at Glasses Store — all frames are kept in stock and glazed in-house, with next day delivery available on standard single vision orders placed before 3pm.
Summary
- UK adult glasses prescriptions are typically valid for two years
- Your optometrist may issue a shorter period for clinical reasons — check the date on your prescription
- Expired prescriptions cannot be used to order glasses — a new eye test is required
- Eye tests are recommended every two years for most adults, or more frequently as advised
NHS eye test entitlement is set out at nhs.uk. The General Optical Council regulates optometrists and dispensing opticians in the UK. Professional guidance on testing frequency is available from the Association of British Dispensing Opticians (ABDO). This article is informational and reflects UK practice as of 2026.
