Vision loss symptoms include sudden flashes or floaters, a shadow or curtain over your sight, sudden blindness in one eye, eye pain with blurred vision, distorted central vision, shrinking side vision, halos, double vision, and poor night vision. Some are emergencies, such as an eye stroke, while others develop slowly. A regular dilated eye exam is the best way to catch silent problems early.
What Are the First Signs of Vision Loss?
The first signs of vision loss are often small changes that are easy to brush off, such as needing brighter light to read, more glare at night, or bumping into things at your side. Some eye diseases, including the most common type of glaucoma, cause no early symptoms at all. Others, like a detached retina, appear suddenly and need care within hours.
Vision loss can affect one eye or both, and it can be partial or complete. Because your stronger eye can hide a problem in the weaker one, it helps to cover one eye at a time now and then to check each eye on its own. Below are 9 vision loss symptoms, grouped by how urgent they are. Knowing which ones are emergencies can help you protect your sight.
Which Vision Loss Symptoms Are Emergencies?
Sudden changes in vision are emergencies, and fast treatment can save sight. Get care right away for these three symptoms:
- 1. Sudden flashes, floaters, or a curtain: a burst of new floaters, flashing lights, or a gray shadow across part of your vision can signal a torn or detached retina.
- 2. Eye pain with blurred vision: severe eye or brow pain, redness, halos, headache, nausea, or vomiting can mean acute angle-closure glaucoma.
- 3. Sudden vision loss in one eye: painless loss of sight in one eye can be an eye stroke, also called a retinal artery occlusion.
An eye stroke should be treated like a brain stroke, so call 911 or go to the ER. For flashes, floaters, or sudden eye pain, call an ophthalmologist right away, or go to the emergency room if you cannot be seen quickly. Learn more about what causes eye stroke.
What Does Blurry Central Vision or Lost Side Vision Mean?
Blurry central vision often points to a problem with the macula, while shrinking side vision is a classic sign of glaucoma. Both usually develop slowly.
- 4. Central blur or distortion: straight lines that look wavy, a dark or empty spot in the center, or trouble reading and recognizing faces can be signs of age-related macular degeneration.
- 5. Peripheral vision loss: missing things at the edges of your sight, or tripping over objects, can mean glaucoma is damaging the optic nerve.
Glaucoma is often called the silent thief of sight because side vision fades so gradually that many people do not notice until damage is severe. Vision lost to glaucoma cannot be restored, but treatment can slow or stop further loss. Some forms of macular degeneration also have treatments that can slow vision loss. Any sudden change in central vision should be checked promptly.
Why Do I See Halos or Have Trouble Seeing at Night?
Halos and poor night vision are often caused by cataracts, a clouding of the eye’s natural lens that is common with age.
- 6. Halos and glare: rings around lights, sensitivity to headlights, and faded or yellowed colors are common cataract signs.
- 7. Worsening night vision: trouble driving after dark or moving around dim rooms can come from cataracts, vitamin A deficiency, or an inherited retinal disease called retinitis pigmentosa.
Cataracts develop slowly and are treated with surgery when they interfere with daily life. Vitamin A deficiency is uncommon in the United States, but it can occur with some digestive conditions or after certain weight-loss surgeries. Retinitis pigmentosa often starts with night blindness and slowly narrows side vision. Halos can also come from uncorrected refractive errors or dry eye, so an exam helps sort out the cause.
What Causes Double Vision or Fluctuating Blurry Vision?
Double vision and blurry vision that changes from day to day can be signs of problems beyond the eye itself.
- 8. Double vision: seeing two of everything, especially when it starts suddenly, can come from nerve, muscle, or brain problems such as stroke, aneurysm, or myasthenia gravis.
- 9. Blurry or fluctuating vision with diabetes: high blood sugar can change your focus, and diabetic retinopathy can damage blood vessels in the retina.
Sudden double vision, especially with a headache, a drooping eyelid, weakness, or trouble speaking, needs emergency care. If double vision goes away when you cover one eye, the cause is more likely inside the eye, such as a cataract or dry eye. People with diabetes should get a dilated eye exam at least once a year, or as often as their doctor advises, because early diabetic retinopathy may cause no symptoms.
When Should You See an Eye Doctor About Vision Changes?
You should see an eye doctor promptly for any new or unexplained change in your vision, and get emergency care for sudden symptoms. Go to the ER, call 911, or get same-day care from an ophthalmologist if you have:
- Sudden vision loss in one or both eyes
- A curtain or shadow over part of your vision
- A sudden shower of floaters or flashes of light
- Severe eye pain with redness, nausea, or halos
- Sudden double vision, a drooping eyelid, or stroke signs like face drooping or slurred speech
For gradual changes, book a comprehensive exam. The American Academy of Ophthalmology recommends a baseline eye disease screening at age 40 for adults without symptoms, and people with diabetes or a family history of glaucoma may need exams more often.
Where Can You Get an Eye Exam in Manhattan, Paramus, or Atlanta?
Diamond Vision offers eye exams and consultations in Manhattan at 2 W. 46th St., in Paramus, New Jersey, and in Hapeville near Atlanta, Georgia, along with other offices in New York, New Jersey, and Connecticut. If you notice gradual blur, glare, or trouble seeing at night, you can schedule an eye exam to find out what is changing.
If your blur turns out to be nearsightedness, farsightedness, or astigmatism, our team, led by Medical Director Dr. Steven W. Stetson, can talk with you about LASIK, PRK, or EVO ICL. Diamond Vision is a vision correction practice, so a retinal detachment, eye stroke, or neurologic problem needs the emergency room or the right specialist first.
Frequently Asked Questions About Vision Loss Symptoms
How do I know if I'm going blind in one eye?
You may be losing vision in one eye if things look blurry, dim, distorted, or partly blocked when you cover your other eye. Because your stronger eye can hide problems, testing each eye separately is important. Sudden loss of vision in one eye, with or without pain, is an emergency that needs care right away. Gradual changes still deserve a prompt exam, since early treatment often protects more sight.
Is there a way to stop going blind?
Many causes of vision loss can be slowed or stopped if they are found early. Glaucoma treatment can protect the remaining optic nerve, and cataract surgery can restore clearer vision. Managing blood sugar, blood pressure, and cholesterol lowers your risk of diabetic and vascular eye disease. Not smoking, wearing UV-blocking sunglasses, and getting regular dilated eye exams also help. Not every condition is preventable, but early care gives you the best chance.
What are the first stages of blindness?
The first stages of vision loss often include blurry or dim vision, more glare, trouble seeing at night, and missing objects to the side. Some people notice that colors look faded or that they need more light to read. With glaucoma, early loss usually happens in side vision and causes no symptoms. Because the early stages are easy to miss, routine eye exams are the most reliable way to catch problems.
Can vision loss be reversed?
Some vision loss can be reversed, and some cannot. Blur from cataracts, refractive errors, or dry eye can often be improved with surgery, glasses, contacts, or treatment. A detached retina that is repaired quickly may regain some vision. Damage from glaucoma, an eye stroke, or advanced macular degeneration is usually permanent, though treatment can help prevent further loss. This is why fast care matters, especially for sudden symptoms.
How often should you get an eye exam?
How often you need an eye exam depends on your age, health, and risk factors. The American Academy of Ophthalmology recommends a baseline eye disease screening at age 40 for adults without symptoms, then follow-up exams as your doctor advises. People with diabetes usually need a dilated exam at least once a year. You may need exams more often if you have glaucoma risk factors, a family history of eye disease, or new symptoms.
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