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For most people, yes. Your eyes aren’t static. The shape of your eyeball, the flexibility of your lens, and the muscles that help you focus all shift gradually over the years, and each of those changes can nudge your prescription in a new direction.
A small increase year over year, especially during childhood, the teen years, or after your 40th birthday, usually reflects your eyes adjusting to a new stage of life. What matters more than the fact that it changed is how much it changed and how quickly.
Why Does My Child’s Prescription Keep Going Up?
If you’re a parent watching your kid’s myopia (nearsightedness) creep up every school year, you’re not alone. Childhood and the teen years are when the eye is still growing, literally getting longer from front to back. As that happens, light tends to focus a little short of the retina instead of right on it, which is what creates nearsightedness.
Most kids’ eyes keep growing until their late teens or early twenties. Genetics play a role too: if you or your partner wear glasses, your child is more likely to need frequent prescription updates as well. Once growth slows in early adulthood, these changes typically settle into a much slower pace.
Why Do Eyes Change After 40?
If you sailed through your 20s and 30s with the same prescription and suddenly need a change in your 40s, this has a name: presbyopia. The lens inside your eye gradually stiffens with age, making it harder to shift focus between something far away and something up close, like a menu or your phone.
Presbyopia shows up for almost everyone eventually, usually somewhere between 40 and 45. You might notice you’re holding books or your phone a little farther away than you used to, or that reading in dim light suddenly feels harder. Reading glasses, bifocals, or progressive lenses often come into the picture around this time, and your prescription may keep adjusting through your 40s and into your 50s as near vision continues to shift.
What About Changes Later in Life?
The lens inside the eye keeps changing shape and clarity through your 50s, 60s, and beyond, which can bring on further prescription tweaks. This is also the stage where cataracts become more common. A cataract is a clouding of the natural lens, and as it develops, it can change how light bends as it enters your eye, sometimes shifting your prescription more noticeably than the usual slow drift.
If your changes start happening faster or feel bigger than what you’re used to, it’s worth a closer look at your overall eye health.
Expected Drift vs. a Jump Worth Flagging
A little bit of movement at each exam, especially at the life stages above, tends to be gradual and predictable. A jump worth flagging looks different: a sudden, sharp increase compared to your usual pattern, vision that changes noticeably within a few months rather than over a year, blurry vision alongside other symptoms like eye pain or new floaters, or a change on only one eye that feels dramatic compared to the other. None of these automatically point to something serious, but they’re a good reason to mention it to your optometrist.
Certain health conditions can affect your prescription in ways that go beyond typical aging. Diabetes, for example, can cause fluid shifts in the eye that lead to temporary blurriness or prescription changes, which is one more reason routine comprehensive eye exams matter beyond just updating your glasses.
So Should You Be Worried?
In the vast majority of cases, no. A prescription that quietly increases at your regular exam is your eyes doing their normal thing, whether that’s a growing eyeball in your teen years, presbyopia setting in around your 40s, or lens changes later on. Once your eyes are done growing, these changes typically slow down, and many adults’ prescriptions stay fairly stable for years at a time.
If your new prescription feels like a big leap, or your vision has changed quickly rather than gradually, bring it up at your next visit or book a comprehensive eye exam sooner rather than waiting.
Once your new prescription is confirmed, our guide to choosing the right lenses can help you figure out which lens type fits your day-to-day life and your specific numbers. And if near vision has become the tricky part, our guide to age-related vision changes and presbyopia covers that stage in more detail.
Frequently Asked Questions
Why does my eye prescription keep changing every year?
It usually comes down to your stage of life. Kids and teens change because the eye is still growing, adults in their 40s change because of presbyopia, and older adults may see changes related to the natural lens aging or, less commonly, cataracts.
How much prescription change is considered normal in a year?
A small, gradual shift, often a quarter to half a diopter, is typical at many life stages. A sudden, much larger jump, or a change that shows up within a few months instead of a year, is worth discussing with your optometrist.
At what age does eye prescription usually stabilize?
For most people, prescriptions tend to level off in the early to mid-20s once eye growth is complete. Presbyopia can bring on new changes again starting around age 40.
Can stress or screen time make my prescription worse?
Stress and screen time can cause temporary eye strain and blurry vision, but they haven’t been shown to permanently change your actual prescription. If your eyes feel strained, it’s still worth getting checked to rule out anything else.
Is a bigger jump in prescription ever a sign of a health problem?
It can be, though it’s not the most common cause. Conditions like diabetes or cataracts can affect how your eyes focus light, so a noticeably larger or faster change is worth mentioning at your next comprehensive eye exam.
Why does my child need a new prescription every single year?
This is common during childhood and the teen years while the eyeball is still growing. Your optometrist can let you know if the rate of change is typical for your child’s age.
Ready to Get Your Vision Checked?
If your prescription has jumped more than usual, or it’s been a while since your last comprehensive eye exam, our team at LMC Optometry & Eye Care can help you figure out what’s going on and get you into the right pair of glasses. Adults and seniors dealing with presbyopia, cataracts, or other age-related changes can book an adult and senior eye exam with one of our optometrists, whether you’re near our Barrie, Thornhill, or Brampton locations or another one of our Ontario clinics.
