Your eyes can tell you a lot more than whether you need a stronger pair of reading glasses.
Blurry vision, strange little specks, yellowing, mysterious rings and even a suddenly drooping eyelid can sometimes provide clues about what's happening elsewhere in your body.
Most eye changes have relatively ordinary explanations. But there are a few symptoms you shouldn't simply chalk up to getting older.
Here are seven weird things your eyes could be trying to tell you.
1. Blurry Vision Could Be More Than "Getting Older"
It's easy to assume blurry vision is simply part of aging.
And sometimes it is.
As we get older, the lens of the eye becomes less flexible, making it increasingly difficult to focus on things up close. Cataracts can also gradually make vision cloudy or blurry.
But blurry vision has many possible causes.
Dry eyes, migraines, certain medications and changes in blood sugar can all affect how clearly you see. Eye conditions including glaucoma and retinal problems can affect vision as well.
The most important clue may be how quickly the change happened.
Vision that's been slowly changing for years is very different from suddenly waking up unable to see clearly out of one eye.
A sudden or significant change in vision deserves prompt medical attention — particularly if it's accompanied by weakness, numbness, difficulty speaking, severe headache or eye pain.
2. Little "Cobwebs" Floating Across Your Vision
Ever look at a bright blue sky and suddenly notice tiny specks, strings or cobweb-like shapes drifting across your vision?
They're called floaters.
And strangely enough, they're not actually floating in front of your eye.
Floaters usually come from tiny clumps or strands within the gel-like vitreous inside your eye. What you're actually seeing is the shadow they cast on your retina.
Floaters become increasingly common as we age and are often harmless.
But there's an important exception.
If you suddenly develop a large number of new floaters — particularly if they're accompanied by flashes of light or a dark curtain or shadow in your vision — get your eyes checked immediately.
Those symptoms can occur when the retina tears or detaches, which can threaten vision if it isn't treated promptly.
3. Flashes Of Light When Nothing Is There
Seeing a quick flash or streak of light can be an unsettling experience.
Sometimes flashes happen when the vitreous gel inside the eye pulls or rubs against the retina.
They can also occur with migraine. Some people experience shimmering lights, zigzag patterns or blind spots as part of a migraine aura — sometimes even without developing a headache afterward.
But new flashes shouldn't automatically be dismissed as migraine or aging.
Flashes accompanied by a sudden increase in floaters deserve urgent attention because they can be associated with a retinal tear or detachment.
Think of a sudden change in your usual vision as your cue to get checked.
4. A White Or Gray Ring Around Your Iris
Take a close look in the mirror.
Do you notice a pale blue, white or gray ring around the colored part of your eye?
There's actually a name for it: corneal arcus.
The ring is caused by deposits of lipids around the edge of the cornea.
Here's where it gets interesting.
In older adults, this ring is extremely common and generally doesn't affect vision. It can simply be part of aging.
But when a similar ring appears in a younger person — particularly under about age 40 — healthcare providers may investigate whether elevated cholesterol or triglycerides could be involved.
So while that mysterious ring isn't necessarily dangerous, age makes a big difference in what it could mean.
5. The Whites Of Your Eyes Turn Yellow
The whites of your eyes are supposed to be...well, white.
So if they suddenly develop a noticeable yellow tint, pay attention.
Yellowing of the eyes can be a sign of jaundice.
Jaundice occurs when too much bilirubin — a yellow substance produced as red blood cells are broken down — accumulates in the body.
Because the liver normally processes bilirubin, yellowing can occur with liver problems. It can also happen when bile drainage is blocked or red blood cells are breaking down unusually quickly.
This isn't a symptom to diagnose yourself from the bathroom mirror.
New yellowing of the whites of your eyes should be evaluated by a healthcare professional.
6. One Eyelid Suddenly Starts Drooping
A drooping upper eyelid is called ptosis.
Sometimes it develops gradually as the muscles and tissues around the eyelid change with age.
But a suddenly drooping eyelid is different.
Nerves and muscles work together to keep your eyelids open, so sudden changes can occasionally signal a neurological problem.
If one eyelid suddenly droops — particularly if you also experience double vision, facial weakness, difficulty speaking, severe headache, weakness on one side or other sudden neurological symptoms — seek immediate medical attention.
The key word again is sudden.
A change you've had for years is very different from one that appeared this morning.
7. You Suddenly See Halos Around Lights
Seeing halos around headlights at night isn't always alarming.
Cataracts and other changes in the eye can cause glare and halos, particularly at night.
But there's one combination you should know about:
Sudden halos + severe eye pain + blurry vision + headache, nausea or a red eye.
That combination can occur with acute angle-closure glaucoma, in which pressure inside the eye rises rapidly.
It's a medical emergency that requires immediate treatment.
So if halos are completely new and appear alongside severe eye pain or other sudden symptoms, don't wait for them to disappear on their own.
Your Eyes Deserve More Attention Than You Think
We're used to checking our blood pressure, cholesterol and weight.
But many of us don't pay nearly as much attention to changes in our eyes.
That's a mistake.
Your eyes are extraordinarily complex structures filled with blood vessels, nerves, muscles and delicate tissues. Changes in their appearance — or in what you see — can sometimes provide useful clues about your health.
That doesn't mean every floater means retinal disease or every blurry morning means something is seriously wrong.
Far from it.
The important thing is knowing what's normal for you and noticing when something suddenly changes.
And remember the symptoms that shouldn't wait:
Sudden vision loss, a sudden shower of floaters or flashes, a curtain or shadow across your vision, severe eye pain, or sudden vision changes accompanied by neurological symptoms warrant urgent medical attention.
Sometimes your eyes aren't simply showing you the world.
They're telling you to pay attention to yourself.
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