Flickering and Visual Noise in Floaters: Causes and Concerns - Ophthalmology

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The symptoms you are experiencing, particularly the flickering sensations and visual noise resembling a malfunctioning television screen, can be quite concerning, especially for someone with a history of floaters and high myopia. It's important to understand the potential causes and implications of these visual disturbances.

Firstly, the phenomenon of floaters is commonly associated with the aging process of the vitreous gel in the eye. In individuals with high myopia, the vitreous can undergo changes more rapidly, leading to symptoms such as floaters and, in some cases, visual distortions. The flickering sensation you describe may be related to the movement of these floaters within the vitreous gel, particularly when you are lying down. When you change positions, the floaters can shift, causing temporary visual disturbances.

The fact that you notice these symptoms primarily when lying down suggests that the position of your head and eyes may be influencing the way light is refracted through the vitreous gel. This can lead to transient visual effects, such as flickering or a "visual noise" effect. Additionally, when lying down, the pressure on the eyes may change slightly, which could also contribute to these sensations.

It's also worth noting that the use of dilating drops during your recent eye examination can temporarily affect your vision. These drops widen the pupil, allowing more light into the eye, which can enhance the perception of floaters and other visual phenomena. However, since you mentioned that your retinal examination was normal, this is a reassuring sign that there are no acute issues with your retina.

In terms of the flickering and visual noise, these symptoms can sometimes be associated with a condition known as "oscillopsia," which is the sensation that the visual field is moving or oscillating. While oscillopsia can be caused by various factors, including vestibular disorders or neurological issues, in your case, it seems more likely to be related to the vitreous changes and the position of your head.

Given your history of high myopia and floaters, it is crucial to monitor these symptoms closely. If the flickering sensations become more frequent, persistent, or are accompanied by other symptoms such as flashes of light, sudden increases in floaters, or changes in vision, it would be advisable to seek further evaluation from an eye care professional. These could be signs of more serious conditions such as retinal detachment or vitreous hemorrhage, which require prompt attention.

In summary, while the symptoms you are experiencing may be related to the normal changes in the vitreous associated with high myopia and floaters, it is essential to remain vigilant. Regular eye examinations and open communication with your eye care provider about any new or worsening symptoms are key to maintaining your eye health. If you have any concerns or if your symptoms change, do not hesitate to reach out to your eye doctor for further evaluation.