Floaters and Flashing Lights: Eye Health Insights - Ophthalmology

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Floaters and flashes, with a stabbing pain?


Hello! Dr.
He has been suffering from floaters for almost three months.
I have been regularly visiting an ophthalmologist.
1) Recently, I woke up in the middle of the night with my eyes closed and saw green light along with a stinging sensation.
I asked the doctor, and he said the green light is normal, but the stinging indicates inflammation, for which he prescribed eye drops.
The stinging has gradually improved, but last night, when my eyes were closed, I saw purple light and colorful flashes, and this morning, I experienced a bit of stinging again (day 7).
2) When I used an electric mosquito swatter to kill mosquitoes, it emitted a spark of light, and about 2 to 3 minutes later, I suddenly saw flashes of light in my eyes.
Since that incident, I have experienced this 2 to 3 times.
It has affected my mental state, making me fearful of turning the lights on or off due to the fear of seeing flashes.
Please provide an explanation.
Thank you!

Xi Yangyang, 30~39 year old female. Ask Date: 2017/05/13

Dr. He Jianxian reply Ophthalmology


It is recommended that you undergo a formal dilated eye examination.
Under normal circumstances, we may observe unexplained flashes of light in the visual field.
If this occurs, it is important to suspect that the retina may be experiencing traction, and a dilated examination should be performed.

Reply Date: 2017/05/13

More Info


Hello! Thank you for your questions regarding floaters and flashing lights in your vision. It’s great to hear that you have been regularly visiting an ophthalmologist, as this is crucial for monitoring your eye health, especially with your history of floaters and recent symptoms.

1. Understanding Floaters and Flashing Lights: Floaters are small specks or strands that drift through your field of vision. They are often caused by changes in the vitreous gel that fills the eye, particularly as we age. Flashing lights, on the other hand, can occur when the vitreous gel pulls on the retina, which can be a normal phenomenon but can also indicate more serious conditions such as retinal tears or detachments. Given your experience of seeing green and purple lights, as well as experiencing pain, it’s essential to keep a close eye on these symptoms.

2. Recent Symptoms: You mentioned experiencing green and purple lights, along with some pain. The green light you described could be a result of the way your eyes are responding to light, especially if you have been experiencing inflammation, as indicated by your doctor. The purple and colorful lights could be related to the same phenomenon, possibly due to the way your retina is processing visual stimuli under certain conditions. The pain you are experiencing could be linked to inflammation, which may require ongoing treatment and monitoring.

3. Flashing Lights from External Stimuli: The incident with the electric mosquito racket causing flashing lights in your vision is concerning. This could be a result of the sudden bright light triggering a response in your retina. If you notice that these flashes continue or worsen, it’s crucial to inform your ophthalmologist, as they may want to conduct a more thorough examination to rule out any potential retinal issues.

4. Psychological Impact: It’s understandable that these visual disturbances can lead to anxiety, especially if you are now fearful of experiencing flashes when turning on or off lights. This psychological aspect can sometimes exacerbate the perception of visual symptoms. It may be helpful to discuss these feelings with your doctor, who can provide reassurance and possibly recommend strategies to help manage your anxiety regarding these symptoms.

5. Recommendations: Continue to follow up with your eye doctor as advised. If your symptoms change or worsen, such as an increase in floaters or flashes, or if you experience a sudden loss of vision, seek immediate medical attention. It’s also beneficial to maintain a healthy lifestyle, including proper hydration, a balanced diet rich in antioxidants, and regular eye exercises to help reduce eye strain, especially if you spend a lot of time on screens.

6. Conclusion: While floaters and flashes can be common, especially in individuals with a history of eye issues, it’s essential to remain vigilant. Regular check-ups and open communication with your healthcare provider are key to ensuring your eye health remains stable. If you have any further concerns or if your symptoms persist, don’t hesitate to reach out to your ophthalmologist for further evaluation and peace of mind.

Take care, and I hope you find relief from your symptoms soon!

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