Eye Flashes: When to Seek Medical Attention - Ophthalmology

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Flashes of light in the eyes?


Hello Doctor, I have been experiencing issues with floaters for a long time.
Recently, I had an examination and was found to have a hole, which was treated with laser.
After the follow-up visit, everything seemed fine.
The doctor mentioned that if I notice an increase in floaters or persistent flashes of light, I should come back for another check-up.
I do see some flashes, specifically a bright point in front of me, which can be both black and white, usually lasting about a second and occurring around three times a day.
However, it seems that the frequency has increased in the past few days, and the flashes in the white areas are more pronounced (without a specific location).
Is this what the doctor referred to as an increase in flashes? Additionally, I would like to ask if floaters can make afterimages more pronounced.
Thank you for your response, Doctor.

Si Pu Lin, 20~29 year old female. Ask Date: 2023/01/17

Dr. Gao Pilin reply Ophthalmology


Hello: If you notice an increase and cannot make a judgment on your own, you should get it checked to avoid missing the opportunity for treatment.
As for afterimages, it is unlikely that floaters will cause an increase in afterimages.

Reply Date: 2023/01/17

More Info


When it comes to experiencing eye flashes, especially in the context of having a history of floaters (known as "myodesopsia"), it is essential to understand the underlying mechanisms and when to seek medical attention. Your situation, where you have previously been diagnosed with a retinal hole and treated with laser therapy, adds a layer of complexity to your symptoms.

Eye flashes can be described as brief bursts of light that may appear as spots or streaks in your vision. These flashes are often caused by the vitreous gel inside the eye pulling on the retina, which can happen as the vitreous shrinks with age or due to other factors. In your case, since you have a history of floaters and a recent retinal hole, the flashes you are experiencing could be related to the ongoing changes in the vitreous.

The fact that you are noticing an increase in the frequency of these flashes, especially against bright backgrounds, is noteworthy. According to your previous medical advice, an increase in the number of flashes or the appearance of new floaters can be a cause for concern, as it may indicate changes in the retina that require further evaluation. It is crucial to monitor these symptoms closely. If you notice a significant increase in the frequency of flashes, or if they are accompanied by other symptoms such as a sudden increase in floaters, a curtain-like shadow in your vision, or any significant changes in your visual acuity, you should seek medical attention promptly.

Regarding your question about whether floaters can exacerbate the perception of afterimages (or "visual persistence"), the answer is yes. Floaters can interfere with your visual clarity and contrast, making it more challenging to focus on objects. This can lead to a heightened awareness of afterimages, especially in bright environments. The presence of floaters can create a visual distraction, which may cause your brain to perceive lingering images more prominently.

In summary, while occasional flashes can be benign, the increase in their frequency, especially in the context of your previous retinal issues, warrants a thorough examination by an eye care professional. Regular follow-ups with your ophthalmologist are essential to ensure that any potential complications are caught early. If you experience any alarming symptoms, do not hesitate to seek immediate medical attention. Your eye health is paramount, and staying vigilant about changes in your vision is the best approach to maintaining it.

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