Visual Phenomena: Light Perception When Eyes Are Closed - Ophthalmology

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The visual phenomena you are experiencing when you close your eyes, such as flashes of light or patterns resembling lightning, can be quite common and are often related to the way our visual system processes information. Let's break down your concerns and provide some insights based on medical knowledge.

1. Understanding Light Perception with Closed Eyes: When you close your eyes, especially in a dark environment, your brain continues to process visual information. This can lead to the perception of light or patterns, even in the absence of external light sources. This phenomenon is known as "phosphene," which occurs when the retina or visual pathways are stimulated, either through pressure, electrical activity, or spontaneous neural activity. The flashes you see can vary depending on the light conditions around you, such as the presence of a screen or bright light source.
2. Normal vs. Abnormal Visual Phenomena: The experiences you describe, such as seeing flashes of light or patterns when closing your eyes, are generally considered normal, especially if they are transient and do not accompany other symptoms like vision loss or persistent discomfort. However, if these flashes are frequent, intense, or associated with other visual disturbances (like a sudden increase in floaters or a shadow in your vision), it is essential to seek further evaluation.
3. Connection to Floaters and Retinal Health: You mentioned having floaters, which are often benign and related to the natural aging of the vitreous gel in the eye. However, in some cases, they can indicate changes in the retina, especially in individuals with high myopia (nearsightedness). If your eye doctor has confirmed that your retina is healthy, the light phenomena you experience may be related to the floaters or the way your brain interprets visual signals when the eyes are closed.

4. Flashes of Light and Retinal Detachment: Flashes of light can sometimes indicate retinal issues, such as retinal detachment or tears, particularly if they are new or accompanied by other symptoms. In your case, since your retina has been checked and found to be healthy, the flashes you see when your eyes are closed are likely benign. However, it is crucial to monitor any changes in your symptoms and report them to your eye care professional.

5. Visual Phenomena with Open Eyes: The flashes or light patterns you see when your eyes are closed are typically not visible when your eyes are open. However, if you experience similar flashes while your eyes are open, especially in bright light or when looking at certain backgrounds, it could be related to the same underlying mechanisms but may warrant further investigation.

In summary, the light phenomena you experience when closing your eyes are likely normal, especially given your recent eye examination indicating no retinal issues. However, it is always wise to stay vigilant and consult your eye doctor if you notice any significant changes in your vision or if the phenomena become more frequent or intense. Regular check-ups are essential, particularly for individuals with high myopia or other risk factors for retinal problems.