Visual Disturbances When Looking at Lights - Ophthalmology

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Visual disturbances, especially when looking at lights, can be concerning and may arise from various underlying mechanisms. The phenomenon you describe, where you see a circle around a light source with moving concentric circles resembling microscopic organisms, is often related to the way our visual system processes light and contrast.

One possible explanation for this visual disturbance is related to the phenomenon known as "entoptic phenomena." These are visual effects that originate within the eye itself rather than from external sources. For example, the moving circles you observe could be due to the presence of floaters in the vitreous humor of the eye. Floaters are tiny clumps of gel or cells that float in the vitreous fluid and can cast shadows on the retina, especially when looking at bright lights. This can create the perception of moving shapes or patterns, particularly in low-light conditions or when looking at bright points of light.

Another potential cause could be related to the way your retina and visual pathways respond to bright stimuli. When you look at a bright light, your photoreceptors (rods and cones) in the retina become highly stimulated. This stimulation can lead to temporary visual phenomena, such as afterimages or halos around lights. The brain processes these signals, and sometimes the result is a perception of patterns or movement that may not be physically present.

Additionally, the phenomenon you describe could also be linked to a condition known as "visual snow." This is characterized by the perception of tiny flickering dots in the visual field, which can be more pronounced in low-light conditions or when looking at bright lights. Visual snow is still being researched, and its exact cause is not fully understood, but it is thought to involve hyperactivity in the visual cortex.

While you mentioned that you have previously undergone dilated eye examinations without any issues being detected, it is essential to continue monitoring your symptoms. If these visual disturbances persist or worsen, it would be prudent to consult with an eye care professional for a comprehensive evaluation. They may recommend additional tests, such as optical coherence tomography (OCT) or a visual field test, to assess the health of your retina and optic nerve.

In summary, the visual disturbances you experience when looking at lights could be due to entoptic phenomena, retinal stimulation effects, or potentially visual snow. While these phenomena can be benign, it is crucial to remain vigilant and seek professional advice if you notice any changes in your vision or if the disturbances become more frequent or bothersome. Regular eye examinations are vital for maintaining eye health and addressing any concerns that may arise.