Blue Light Spots in Dark: Eye Health Insights - Ophthalmology

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When the lights are turned off at night, I see many small blue light spots in front of my eyes?


Hello, Doctor Gao: I have myopia of 1000 degrees and also experience floaters.
After a dilated eye exam, my retina was found to be healthy.
However, when I enter a dark room at night, I see many small blue light spots flashing in front of me, followed by a blue circular layer that keeps approaching.
During the day, with the lights on, I see a faint, branch-like formation floating on the wall.
I'm not sure what is happening with my eyes.
Could this be cataracts or an issue with the macula?

Amy, 30~39 year old female. Ask Date: 2022/10/09

Dr. Gao Pilin reply Ophthalmology


Hello Amy: The small blue light may be a form of photopsia, which is a physiological phenomenon.
The drifting branches are likely indicative of floaters.

Reply Date: 2022/10/09

More Info


Hello! It sounds like you're experiencing some visual disturbances that can be concerning, especially given your history of high myopia (near-sightedness) and floaters. Let's break down your symptoms and provide some insights into what might be happening.

Firstly, the presence of blue light spots or flashes, especially in low-light conditions, can be attributed to several factors. In your case, since you have a high degree of myopia and floaters, it's possible that what you're seeing is related to the floaters themselves. Floaters are tiny clumps of gel or cells that form in the vitreous humor of the eye, and they can cast shadows on the retina, leading to the perception of spots or shapes, particularly when looking against a bright background or in dim lighting.

The blue color you describe could also be a result of the way your brain interprets light and shadows in low-light conditions. The human eye is more sensitive to blue light in dim environments, which might explain why you perceive these blue spots. However, if these symptoms are new or have changed in intensity, it’s essential to monitor them closely.

Regarding your concerns about cataracts or macular degeneration, it's important to note that these conditions typically present with different symptoms. Cataracts usually cause a gradual blurring of vision, increased glare, and difficulty seeing at night, while macular degeneration often leads to a loss of central vision or distortion of straight lines. Since your retinal examination was normal, it is less likely that you are experiencing these conditions at this time.

However, given your high myopia, you are at a higher risk for certain eye conditions, including retinal detachment and other complications. If you notice any sudden changes in your vision, such as an increase in floaters, flashes of light, or a curtain-like shadow over your vision, you should seek immediate medical attention.

As for your question about blue light and its effects on eye health, current research has not definitively linked blue light exposure from screens to significant eye damage or conditions like cataracts. While blue light can contribute to digital eye strain, which may cause discomfort, it does not appear to be a direct cause of cataracts or macular degeneration. Wearing blue light filtering glasses can help reduce discomfort during prolonged screen time, but they are not a substitute for regular eye care.

In terms of eye health maintenance, incorporating nutrients like lutein and zeaxanthin, which are found in leafy greens and other vegetables, can be beneficial for eye health. While blueberries are rich in antioxidants, there is limited evidence to suggest they have a direct protective effect on eye health. A balanced diet rich in vitamins A, C, and E, along with omega-3 fatty acids, can also support overall eye health.

In conclusion, while your symptoms may be concerning, they are not necessarily indicative of severe eye conditions like cataracts or macular degeneration, especially given your recent eye examination results. However, it is crucial to keep monitoring your symptoms and consult with an eye care professional if you notice any significant changes. Regular eye exams are essential, especially for individuals with high myopia, to ensure any potential issues are caught early.

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