If you see a halo or glare around dim lights, call your doctor – Best Life

Some changes in your sense of sight are immediately alarming and require an urgent appointment for eye care. But experts warn that more subtle symptoms are often overlooked because they can seem relatively normal and indifferent, and one eye phenomenon in particular could signal a condition requiring prompt medical attention. Read on to find out which symptom could be affecting your vision and how to know when to call your doctor.

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If you suddenly lock your eyes with bright light (the sun, car headlights, or a camera flash, for example), you’ll likely notice glare or a halo around it. When this happens, light scatters in the eye rather than being processed normally by the retina. While it’s not exactly pleasant, it’s unlikely to have any long-term consequences for your eye health or vision. The symptom will usually go away on its own within minutes to hours, experts say.

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Man with poor night vision looking at a computer

This same reaction may suggest a more serious problem if you notice it at night or when the lights are dim. That’s because this symptom is often associated with Fuchs’ dystrophy (pronounced “fewks”), a condition that can lead to corneal swelling (also known as corneal edema).

According to the Mayo Clinic, it’s important to “see an eye care professional, who may then refer you to a corneal specialist” if you notice this particular set of symptoms. They add that you should call emergency care if symptoms develop suddenly. They note that other conditions that may share these symptoms — glaucoma or cataracts, for example — also require medical attention.

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Fuchs dystrophy occurs when endothelial cells in the eye break down, causing fluid to build up in the cornea, the transparent layer of tissue at the front of the eye. This causes the cornea to thicken and swell, triggering a series of symptoms.

This form of ocular dystrophy “usually affects both eyes and can cause your vision to gradually deteriorate over the years,” explains the Mayo Clinic. “Typically, the disease begins in their 30s and 40s, but many people with Fuchs dystrophy do not develop symptoms until they are in their 50s or 60s,” their experts add.

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Woman receiving an eye exam

People with Fuchs dystrophy may notice that seeing halos or glare when looking at dim lights means their night vision is poor. Patients may also notice blurred vision, a fluctuation in vision that starts badly at the start of the day and then improves, small blisters on the surface of the cornea, eye pain, or the appearance of cloudiness on the eye.

Talk to your doctor if you think you have symptoms or Fuchs dystrophy or corneal swelling.

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