Eye Floaters and Flashing Lights: What You Need to Know - Ophthalmology

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Experiencing floaters and flashes of light when sleeping in the dark?


Doctor, I apologize for the interruption.
A few days ago, I asked a question, and you mentioned, "If the flashes occur after the examination, further investigation is needed." I forgot to add that I am going for an examination in early March because I experienced flashes.
However, in the past few days, when I turn off the lights to sleep, my eyes flash, and when I move my eyeballs, they also flash.
But after about 1 to 2 minutes, it gradually disappears and returns to normal.
This is somewhat different from the flashes I experienced before, and I'm not sure if it might be due to visual fatigue causing these flashes.

Kai, 10~19 year old female. Ask Date: 2022/04/11

Dr. Gao Pilin reply Ophthalmology


Hello, Kai: Fatigue should not cause flashes; movement causing flashes is more likely related to vitreous traction.

Reply Date: 2022/04/11

More Info


Experiencing eye floaters and flashing lights can be concerning, especially for individuals with a history of high myopia or other eye conditions. It's essential to understand the underlying mechanisms and potential implications of these visual phenomena.


Understanding Eye Floaters and Flashing Lights
Eye Floaters: Floaters are small specks or strands that drift through your field of vision. They are typically caused by changes in the vitreous humor, the gel-like substance filling the eye. As we age, the vitreous can become more liquid and may pull away from the retina, leading to the perception of floaters. While floaters are usually harmless, they can sometimes indicate more serious conditions, especially if they suddenly increase in number or are accompanied by flashes of light.

Flashing Lights: The sensation of flashing lights, or photopsia, often occurs when the retina is stimulated. This can happen due to various reasons, including:
1. Vitreous Detachment: As the vitreous gel shrinks and pulls away from the retina, it can tug on the retinal surface, causing flashes of light. This is common in individuals with high myopia, as the shape of the eye can predispose them to vitreous detachment.

2. Retinal Issues: Flashes can also indicate more serious conditions, such as retinal tears or detachment. If the retina is torn, it can lead to significant vision loss if not treated promptly.

3. Migraine Aura: Some individuals experience visual disturbances, including flashing lights, as part of a migraine aura, even if they do not have a history of migraines.

4. Visual Fatigue: Prolonged periods of focusing on screens or reading can lead to visual fatigue, which may manifest as temporary flashes or disturbances in vision.


When to Seek Medical Attention
Given your history of high myopia and the recent onset of these symptoms, it is crucial to monitor your condition closely. Here are some guidelines on when to seek medical attention:
- Sudden Increase in Floaters: If you notice a sudden increase in floaters, especially if they are accompanied by flashes of light, it is essential to see an eye care professional immediately.

- Persistent Flashes: If the flashes of light persist or become more frequent, this warrants further investigation.

- Accompanying Symptoms: If you experience other symptoms such as a curtain-like shadow over your vision, significant vision loss, or any other unusual visual disturbances, seek medical attention promptly.


Conclusion
While occasional flashes of light and floaters can be benign, especially if they are transient and not accompanied by other symptoms, your specific situation—given your high myopia and previous eye conditions—merits careful observation. It is advisable to keep your upcoming eye examination appointment and discuss these symptoms in detail with your eye care provider. They may perform a comprehensive dilated eye exam to assess the health of your retina and vitreous humor.

In the meantime, try to reduce eye strain by taking regular breaks from screens and ensuring proper lighting when reading or working. Staying hydrated and maintaining a healthy lifestyle can also support overall eye health. Remember, it’s always better to err on the side of caution when it comes to your vision.

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