Light Halos Around Lights: Eye Health Insights - Ophthalmology

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Hello Doctor: While walking at night, I occasionally notice a halo of light surrounding certain streetlights (the color of the halo varies depending on the color of the light).
I recently had my intraocular pressure measured, and it was normal; my cornea is not swollen either.
This doesn't seem to be a symptom of astigmatism.
Is there something wrong with my eyes?

Hai pa de ren, 20~29 year old female. Ask Date: 2021/03/17

Dr. Gao Pilin reply Ophthalmology


Hello, those who are afraid: As long as there is a refractive error in the eyes, seeing lights will create a halo effect, which is different from the halos associated with glaucoma.
Please rest assured.
The Ophthalmology Department of Puzi Hospital in Taiwan: Open Monday, Tuesday, Thursday, and Friday mornings from 8:00 AM to 12:00 PM, and Wednesday afternoons from 2:00 PM to 4:30 PM.
Online responses are for reference only; it is necessary to visit a medical institution for treatment.
We hope to have the opportunity to serve you.
Gao Pilin.

Reply Date: 2021/03/17

More Info


The phenomenon of seeing halos or light rings around bright lights, especially at night, can be concerning for many individuals, particularly those with high myopia or other pre-existing eye conditions. In your case, you have reported experiencing these halos around lights, which can manifest as colored rings depending on the light source. This symptom can be attributed to several factors, and understanding these can help alleviate your concerns.

Firstly, halos around lights can often be a result of optical aberrations in the eye. In individuals with high myopia, the shape of the eyeball can cause light to focus incorrectly, leading to visual distortions such as halos. Additionally, if you wear contact lenses, particularly rigid gas permeable lenses, they can sometimes induce changes in the way light is refracted through the eye, especially if they are not fitting perfectly or if there is a tear in the lens.

Another common cause of halos is dry eye syndrome. When the eyes are not adequately lubricated, the surface of the cornea can become irregular, leading to light scattering and the perception of halos. You mentioned that you have experienced dry eyes, which could contribute to this visual phenomenon. It is essential to maintain proper hydration of the eyes, especially if you wear contact lenses for extended periods. Using artificial tears or lubricating eye drops can help alleviate dryness and improve visual clarity.

Furthermore, conditions such as cataracts can also lead to the perception of halos around lights. Although you have indicated that your cornea is healthy and your intraocular pressure is normal, it is still worth monitoring for any changes in your vision. Cataracts typically develop slowly and may not be immediately noticeable, but they can cause increased glare and halos, particularly in low-light conditions.

Another consideration is the phenomenon of glare, which occurs when bright lights overwhelm the eye's ability to adapt. This can be exacerbated by factors such as fatigue, stress, or even certain medications. If you find that your symptoms worsen in specific situations, such as after prolonged screen time or during periods of stress, it may be beneficial to take regular breaks and practice good eye hygiene.

In terms of your concern about whether this indicates a more severe issue, it is reassuring that your eye pressure is normal and that you have had thorough examinations without any significant findings. However, if the halos persist or worsen, or if you experience any additional symptoms such as vision loss, increased floaters, or flashes of light, it would be prudent to seek further evaluation from an eye care professional.

In summary, while the presence of halos around lights can be disconcerting, it is often related to benign causes such as optical aberrations, dry eyes, or glare. Maintaining good eye health through proper hydration, regular eye exams, and managing any underlying conditions is crucial. If you have ongoing concerns, do not hesitate to consult with your eye care provider for personalized advice and potential treatment options.

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