Seeing Flashes in the Dark: Eye Health Concerns from Phone Use - Ophthalmology

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Seeing flashes of light in your vision, especially when using your phone in the dark, can be concerning, but it’s important to understand the context and potential causes. Based on your description, it seems that you are experiencing flashes in your left eye, which is accompanied by a history of myopia (nearsightedness) and some floaters (often referred to as "flying mosquitoes").
Flashes of light, or photopsia, can occur for several reasons, and while they can be alarming, they are not always indicative of a serious problem. In many cases, flashes are related to the vitreous gel inside the eye. As we age or due to certain visual habits, the vitreous can begin to pull away from the retina, which may cause these flashes. This is often benign, especially if there are no accompanying symptoms like a sudden increase in floaters or a shadow in your peripheral vision.

Given that you mentioned using your phone in a dark room, it’s possible that the contrast between the bright screen and the dark environment is contributing to visual discomfort, including the perception of flashes. When you focus on a bright screen for an extended period, especially in low light, your eyes can become fatigued, leading to temporary visual disturbances.

Regarding your concerns about retinal issues, such as retinal detachment or tears, these conditions can indeed present with flashes and floaters. However, if you have had a recent eye examination that showed no signs of retinal problems, and if the flashes are intermittent and not accompanied by other alarming symptoms, it is likely that you are experiencing a benign condition related to the vitreous.

As for your question about whether resting for a few days will help, it is generally advisable to take regular breaks from screen time to reduce eye strain. The 20-20-20 rule is a good guideline: every 20 minutes, look at something 20 feet away for at least 20 seconds. This practice can help alleviate symptoms of digital eye strain.

If you are concerned about the vitreous separating from the retina, it is important to note that this is a natural process that occurs with age and is not something that can be hastened or delayed. If the vitreous does separate, it typically does not cause long-term issues unless it leads to a retinal tear or detachment, which is rare.
If you choose not to see a doctor, it is crucial to monitor your symptoms closely. If you notice a sudden increase in floaters, new flashes, or any changes in your peripheral vision (like a curtain or shadow), you should seek medical attention promptly.
In summary, while your symptoms may be concerning, they are not uncommon, especially with your history of myopia and floaters. Taking breaks from screen time, ensuring proper lighting while using devices, and monitoring your symptoms are good practices. However, if you have persistent concerns or if your symptoms worsen, it is always best to consult with an eye care professional for a thorough examination. Your eye health is important, and early detection of any potential issues can lead to better outcomes.