Flashing Lights in Vision: Causes and Concerns - Ophthalmology

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Flashing lights in vision can be a concerning symptom, especially for individuals with existing vision issues like myopia (nearsightedness). Your experience of seeing flashes when lying down and looking at the ceiling or wall could be attributed to several factors, including changes in the vitreous gel inside the eye, which is common in people with myopia.
When you mention that the flashes resemble a flickering light bulb, this could indicate that the vitreous gel is pulling on the retina or that there are small opacities within the vitreous that are casting shadows on the retina. This phenomenon is often referred to as "photopsia." It is not uncommon for people with myopia to experience these symptoms, particularly if they have a history of floaters or other vitreous changes.
The fact that these flashes occur primarily when you are in a specific position (lying down and looking up) suggests that it may be related to the mechanical movement of the vitreous gel in relation to the retina. However, if these flashes persist or are accompanied by other symptoms such as a sudden increase in floaters, a shadow in your peripheral vision, or a decrease in vision, it is crucial to seek an eye examination promptly. These could be signs of more serious conditions, such as retinal tears or detachment.

Regarding your concern about whether this could be related to excessive eye strain from prolonged computer use, it is possible. Extended periods of focusing on screens can lead to digital eye strain, which may cause temporary visual disturbances, but it is less likely to cause the type of flashing lights you described. However, eye strain can exacerbate existing conditions and may lead to discomfort or visual disturbances.

As for the visual "noise" you mentioned, particularly in low-light conditions, this could be related to a phenomenon known as "visual snow." This condition can manifest as a persistent visual disturbance that resembles static or noise, especially in dim lighting. The presence of moving purple shadows in the dark could also be a form of entoptic phenomenon, where the eye perceives its own structures, such as the vitreous or retinal cells, especially when the visual system is under low light conditions.

While these symptoms can be benign, they warrant further investigation, especially since you have been experiencing them since childhood. It is essential to differentiate between normal variations in visual perception and potential underlying ocular conditions.
In summary, while occasional flashes of light may not be alarming, especially in the context of myopia, it is essential to monitor the frequency and nature of these occurrences. If they become more frequent, change in character, or are accompanied by other visual disturbances, a comprehensive eye examination is recommended. Regular check-ups with an eye care professional can help ensure that any potential issues are identified and managed appropriately.