As we get older, some changes in our vision are expected.
You may need brighter light to read. Small print may become harder to see. It may take your eyes a little longer to adjust when you walk into a dark room.
Those changes can be frustrating, but they are often part of normal aging.
Other changes are different.
Sometimes a change in your vision is your eye’s way of telling you that something needs attention. And occasionally, getting medical care quickly can make the difference between protecting your vision and permanently losing some of it.
The key is knowing which symptoms shouldn’t wait.
Here are seven warning signs from your eyes that I don’t want you to ignore.
1. A Sudden Increase in Floaters or Flashes of Light
Have you ever noticed little specks, strings, cobwebs, or dots drifting across your vision?
These are called floaters, and they become increasingly common as we age. A few longstanding floaters are usually not an emergency.
But pay attention if you suddenly develop many new floaters, especially if they are accompanied by flashes of light.
As we age, the gel-like material inside the eye, called the vitreous, changes and can pull away from the retina. This is common and often harmless.
But occasionally it can create a tear in the retina. Fluid can then get underneath the retina and cause a retinal detachment.
You may also notice what looks like a curtain, shadow, or dark area moving across part of your vision.
Don’t wait on this one. A sudden shower of new floaters, flashing lights, or a curtain or shadow in your vision deserves prompt evaluation by an eye professional.
2. Sudden Loss of Vision
If you suddenly lose vision in one eye—or even part of the vision in one eye—consider it an emergency.
Don’t assume it will go away.
Sudden vision loss can have several causes. One is a blockage of blood flow to the retina. Another is retinal detachment. Bleeding inside the eye can also interfere with vision.
Sometimes sudden visual changes can even be related to a problem involving the brain, including a stroke.
If sudden vision loss occurs along with symptoms such as weakness, numbness, facial drooping, trouble speaking, severe dizziness, or difficulty walking, call 911.
Even without those symptoms, sudden unexplained vision loss needs urgent medical attention.
Dr. Mike’s Take: When vision disappears suddenly, don’t make an appointment for next month. Get evaluated promptly.
3. Eye Pain With Redness or Blurred Vision
A mildly irritated eye is common.
Maybe you’ve been outside on a windy day. Maybe your eyes are dry. Maybe you’ve spent too much time staring at a screen.
But significant eye pain—particularly when combined with redness, blurred vision, headache, nausea, or seeing halos around lights—is different.
One possible cause is acute angle-closure glaucoma, in which pressure inside the eye can rise rapidly.
This isn’t the most common form of glaucoma. In fact, the more common open-angle glaucoma often develops slowly without obvious early symptoms.
But acute angle-closure glaucoma can threaten vision quickly.
Severe or rapidly developing eye pain deserves medical attention, particularly when your vision has changed at the same time.
4. Straight Lines Suddenly Look Wavy
Here’s a simple observation that can tell you quite a bit about your central vision.
Look at something you know should be straight—the edge of a door, window blinds, or lines of text.
Do the lines suddenly look bent, distorted, or wavy?
That can be a warning sign of a problem involving the macula, the central part of the retina responsible for the sharp vision we use for reading, driving, and recognizing faces.
One important cause after age 50 is age-related macular degeneration, or AMD.
Another warning sign can be a blurry, distorted, or dark spot near the center of your vision.
These changes aren’t something to simply blame on needing stronger reading glasses.
If you notice new distortion or a new change in your central vision, schedule an eye examination promptly.
5. Double Vision That Starts Suddenly
Seeing two images instead of one can be frightening—and it shouldn’t be ignored.
Double vision can come from a problem with the eye itself, but it can also result from problems involving the nerves or muscles controlling eye movement.
Sometimes there are relatively straightforward explanations. Other times, sudden double vision can be associated with a neurological problem, including stroke.
If you suddenly develop double vision, particularly if it occurs along with weakness, numbness, facial drooping, severe headache, dizziness, difficulty speaking, or problems walking, seek emergency care.
The important word here is suddenly.
A new, unexplained neurological or visual symptom deserves attention.
6. Your Vision Is Becoming Cloudy or Hazy
This one usually isn’t an emergency, but it is worth discussing with your eye doctor.
Many people describe it this way:
“Doc, it feels like I’m looking through a dirty window.”
One common reason is a cataract.
The normally clear lens inside your eye gradually becomes cloudy. Colors may appear less bright. Night driving may become difficult. Headlights may produce glare, and you may find yourself needing more light to read.
Cataracts are extremely common as we get older, and fortunately, they can often be treated very effectively when they begin interfering with everyday activities.
The mistake is assuming worsening vision is simply something you have to accept because you’re getting older.
It isn’t.
7. You’re Losing Your Side Vision
This may be one of the easiest warning signs to miss because it can happen so gradually.
You may still be able to read the eye chart reasonably well while slowly losing some of your peripheral—or side—vision.
One important cause is glaucoma.
Glaucoma damages the optic nerve, which carries visual information from the eye to the brain. The most common form often produces no pain and few noticeable symptoms in its early stages.
That’s exactly why routine comprehensive eye examinations become so important as we get older.
You don’t want to wait until you notice significant vision loss before discovering glaucoma.
Treatment cannot usually restore vision that has already been lost, but it can often slow or prevent further damage.
Don’t Wait for Symptoms to Protect Your Eyes
There’s an important lesson here.
Some serious eye diseases cause obvious warning signs. Others don’t.
That’s why protecting your vision isn’t just about knowing when something is wrong. It’s also about finding problems before you notice them.
Regular comprehensive eye examinations can help detect conditions such as glaucoma, cataracts, macular degeneration, and diabetic eye disease.
How often you need an exam depends on your age, medical history, family history, previous eye findings, and risk factors. People with diabetes, glaucoma risk, previous eye disease, or certain other medical conditions may need more frequent examinations.
And remember: your eyes are connected to the rest of your health.
Blood pressure, blood sugar, smoking, medications, cardiovascular health, and other medical conditions can all affect your vision.
Remember This
Most gradual changes in vision are not emergencies, and many age-related eye problems can be treated or managed.
But certain symptoms deserve quick attention.
Sudden vision loss, a shower of new floaters or flashing lights, a curtain or shadow across your vision, severe eye pain with vision changes, sudden double vision, or sudden distortion of your central vision should not be ignored.
When it comes to your eyesight, waiting to see what happens isn’t always the safest strategy.
The Bottom Line
Your vision will probably change as you get older.
That doesn’t mean every change is “just aging.”
Pay attention to what your eyes are telling you. Keep up with your regular eye examinations. And when something changes suddenly or dramatically, get it checked.
You only get one pair of eyes.
Taking care of them is another important part of staying healthy, independent, and active for years to come.