Flashing Lights in Vision: Causes and Concerns - Ophthalmology

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Experiencing flashing lights in your vision, especially after prolonged use of screens such as smartphones or computers, can be concerning. However, it is essential to understand the potential causes and implications of these symptoms.
Firstly, the sensation of surrounding light becoming brighter and colors appearing washed out can be attributed to several factors. One common reason is eye strain, also known as asthenopia, which occurs when your eyes become fatigued from extended periods of focusing on screens. Symptoms of eye strain can include blurred vision, headaches, and the sensation of seeing flashes or flickers of light. This is particularly prevalent in individuals who spend long hours in front of screens without taking breaks.

The phenomenon of seeing flashes of light or white lines, especially when moving your head or eyes, may be related to the vitreous humor in your eyes. The vitreous humor is a gel-like substance that fills the eye and can change with age or due to various factors, such as myopia (nearsightedness). When the vitreous pulls away from the retina, it can cause flashes of light, often described as "photopsia." This is generally harmless but can sometimes indicate more serious conditions, such as retinal tears or detachments, particularly in individuals with high myopia.

In your case, given that you have a history of myopia, it is crucial to monitor these symptoms closely. If the flashes become more frequent, are accompanied by a sudden increase in floaters (the "flies" you see in your vision), or if you experience a loss of peripheral vision, it is advisable to seek an eye examination promptly. An eye care professional can perform a comprehensive dilated eye exam to assess the health of your retina and vitreous.

Moreover, the experience of visual disturbances after screen use can also be linked to a condition known as visual fatigue or digital eye strain. This condition can lead to temporary changes in vision, including the perception of flashing lights or altered color perception. To alleviate these symptoms, consider implementing the 20-20-20 rule: every 20 minutes, take a 20-second break to look at something 20 feet away. Additionally, ensuring proper lighting while using screens and adjusting the brightness and contrast settings can help reduce eye strain.

In conclusion, while experiencing flashes of light and changes in vision can be common, especially after extended screen time, it is essential to remain vigilant. If these symptoms persist or worsen, a thorough evaluation by an eye care professional is warranted to rule out any underlying issues. Regular eye check-ups are crucial, especially for individuals with myopia, to maintain optimal eye health and address any concerns early on.