Why Does Your Glasses Prescription Change Over Time?
Have you ever noticed that your glasses prescription seems to change every few years? Maybe your vision has become a little blurry, you're squinting more often, or you're finding it harder to focus on things that used to look perfectly clear.
If so, you're not alone. Changes in your glasses prescription are a normal part of life for many people. Our eyes change as we grow, age, and experience different health conditions, which can affect how clearly we see.
But what actually causes your prescription to change? Does wearing glasses too often make your eyesight worse? And how do you know when it's time for a new prescription?
At Cityscape Eyecare, we believe understanding your vision is an important part of taking care of your eyes. Let's look at why your prescription may change over time and what you can do to keep your vision clear.
What Does Your Glasses Prescription Actually Mean?
Your glasses prescription tells your optometrist which lens strengths are needed to help light focus correctly on your retina, the light-sensitive tissue at the back of your eye. When light doesn't focus properly, you may experience a refractive error.
The main types of vision conditions include:
Nearsightedness (myopia): You can see nearby objects clearly, but distant objects look blurry.
Farsightedness (hyperopia): Close-up objects may be difficult to focus on, although the effects vary depending on the degree of farsightedness.
Astigmatism: An irregularly shaped cornea or lens causes light to focus unevenly, potentially making objects look blurry or distorted.
Presbyopia: An age-related change that makes it harder to focus on nearby objects, especially when reading or using your phone.
Your prescription accounts for the type and degree of refractive error you have. As your eyes change, the lens strength needed to provide clear vision may change too.
6 Reasons Your Glasses Prescription May Change
There isn't just one reason your prescription changes. Several factors can affect your vision throughout your life.
1. Your Eyes Change as You Age
Age is one of the most common reasons for changes in vision. Children and teenagers often experience changes in their prescriptions as their eyes grow. Nearsightedness, for example, frequently develops during childhood and may continue to progress through the teenage years and into early adulthood.
For many people, prescriptions become more stable in adulthood, but that doesn't mean they will stay exactly the same forever. As you get older, the natural lens inside your eye also becomes less flexible. This makes it harder to focus on objects up close, a condition known as presbyopia. It often becomes noticeable in your early to mid-40s.
You might find yourself holding your phone farther away to read a message or needing brighter lighting to see small print. These are common signs that your near vision may be changing. Later in life, conditions such as cataracts can also affect the way you see and may lead to changes in your prescription.
2. Genetics and the Shape of Your Eyes
Your genes can influence your vision. If your parents are nearsighted or farsighted, you may be more likely to develop similar refractive errors. The shape and length of your eye also play an important role in how light focuses on your retina. If your eye grows slightly longer than average, for example, you may develop nearsightedness. Although you can't change your genetics, regular eye exams can help your optometrist monitor your vision and identify changes as they occur.
3. Your Daily Habits and Visual Demands
The way you use your eyes throughout the day can influence your visual comfort and may be relevant to how your vision develops. Many of us spend hours looking at computers, phones, tablets, and other nearby objects. Extended screen use can contribute to digital eye strain, which may cause symptoms such as tired eyes, headaches, temporary blurred vision, and difficulty focusing.
These symptoms don't automatically mean your glasses prescription has changed. Sometimes, your eyes simply need a break.
To support comfortable vision throughout the day, try to:
Take regular breaks from screens and close-up work.
Look away from your screen periodically to relax your focusing system.
Keep your screen at a comfortable distance and adjust the lighting to reduce glare.
Encourage children to spend time outdoors each day.
If blurry vision or eye strain continues despite these adjustments, an eye exam can help determine whether a prescription change or another issue may be responsible.
4. Hormonal Changes
Hormonal fluctuations can sometimes affect your vision. Pregnancy, for example, can cause temporary changes in the cornea, tear film, or fluid balance in the body. Some people notice that their eyes feel drier or that their vision seems slightly different during pregnancy.
Hormonal changes can also affect tear production, contributing to dry eye symptoms that make vision fluctuate throughout the day.
5. Certain Health Conditions and Medications
Your overall health can affect your eyesight more than you might expect. Diabetes is one example. Changes in blood sugar levels can cause fluid shifts in the lens of the eye, temporarily affecting how clearly you see. Once blood sugar levels stabilize, vision may change again.
Long-term diabetes can also affect the blood vessels in the retina, leading to diabetic retinopathy. This is a more serious concern that requires appropriate monitoring, even if your vision seems normal.
Other eye conditions, including cataracts, can also change your vision or affect the prescription you need. Some medications may contribute to dry eyes or other visual side effects, too.
6. Your Prescription May Change Gradually
Sometimes, there's no single event or obvious reason behind a prescription change. Your vision may shift gradually over several months or years. Because these changes can happen slowly, you might not notice them right away. You may adapt by squinting, moving closer to the television, increasing the font size on your phone, or avoiding tasks that have become difficult. Eventually, you may realize that your current glasses no longer provide the clarity you're used to. This is one reason regular comprehensive eye exams are important. Even when your vision seems fine, an eye exam can help identify subtle changes and check your overall eye health.
Does Wearing Glasses Make Your Eyesight Worse?
This is one of the most common myths about glasses, and the answer is no. Wearing
glasses does not make your eyes weaker or cause your prescription to increase. Glasses correct how light focuses inside your eyes. They help you see more clearly, but they don't permanently change the underlying shape or structure of your eyes.
If your prescription becomes stronger after you've started wearing glasses, it's understandable to wonder whether the glasses caused it. In most cases, the change is related to the natural development of your eyes, age, or another underlying factor.
You may also notice that your vision seems blurrier when you take your glasses off after wearing them regularly. This can happen because you're accustomed to seeing the sharper image your glasses provide. It doesn't mean your eyes have become dependent on them.
The right prescription should make everyday activities more comfortable and help you see clearly. If your glasses cause headaches, dizziness, or persistent discomfort, however, it's worth having them checked.
Signs You May Need a New Glasses Prescription
Not every vision change is obvious. Here are some signs that it may be time to book an eye exam:
Blurry vision: Objects look less sharp, whether you're reading, driving, or looking across a room.
Frequent squinting: You find yourself squinting to make words or objects clearer.
Headaches or eye strain: Your eyes feel tired after reading, working on a computer, or doing other visual tasks.
Difficulty seeing at night: Driving after dark becomes more uncomfortable, or lights appear more distracting than usual.
Trouble focusing: Switching between near and far objects feels more difficult.
Changes in reading habits: You need to hold reading material farther away or increase the font size to see comfortably.
Important: Sudden vision loss, a sudden increase in floaters, flashes of light, a curtain-like shadow in your vision, or significant eye pain requires urgent medical assessment. Don't wait for a routine glasses appointment if these symptoms occur. Call your optometrist immediately and they will help you with the next steps!
How Often Should You Have an Eye Exam?
You don't have to wait until your glasses stop working well to book an eye exam.The appropriate frequency depends on your age, eye health, medical history, vision needs, and whether you've experienced any recent changes. Children, people with certain health conditions, and those with existing eye problems may need more frequent assessments.
Even if your prescription has remained stable for years, regular exams help your optometrist monitor your eye health and look for changes that may not cause noticeable symptoms at first. We recommend coming in for a routine eye health assessment at least every one to two years.
Keep Your Vision Clear With Cityscape Eyecare
Your eyes can change throughout your life, and your glasses prescription may change along with them. Age, genetics, the development of your eyes, hormonal fluctuations, and certain health conditions can all play a role.
If your current glasses aren't giving you the clarity and comfort you're used to, or it's been a while since your last eye exam, contact Cityscape Eyecare to book an appointment. We're here to help you understand your vision and find the right solution for your needs.
Frequently Asked Questions
Why does my glasses prescription keep changing?
Your prescription may change because of natural eye growth, ageing, genetics, presbyopia, or certain health conditions. Some people experience more frequent changes than others.
Does wearing glasses make your eyesight worse?
No. Glasses correct refractive errors but don't weaken your eyes or cause your prescription to increase.
Is it normal for your prescription to change every year?
It can be, particularly for children and teenagers whose eyes are still developing. Adults can also experience yearly changes, although frequent or unexpected changes should be assessed by an optometrist.
How often should I update my glasses prescription?
There isn't one schedule that works for everyone. Follow the eye exam schedule recommended by your optometrist, and book an assessment sooner if you notice a change in your vision.
Tags: glasses prescription, changing vision, eye exams, blurry vision, eye health, vision changes, Calgary NE, Cityscape
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