Occasional Circular Shadows When Eyes Are Closed - Ophthalmology

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When experiencing occasional circular shadows or black spots in your vision, especially after closing your eyes and then reopening them, it can be concerning. Given your history of myopia (nearsightedness) and the recent appearance of this phenomenon, it’s important to understand the potential causes and implications.

The circular shadow you describe could be attributed to several factors. One common explanation is related to the vitreous gel within the eye. As we age or due to certain conditions, the vitreous can begin to shrink and pull away from the retina, a process known as posterior vitreous detachment (PVD). This can lead to the perception of floaters or shadows, particularly when the eye is moved quickly or when transitioning from a closed to an open state.
Another possibility is related to the phenomenon of "phosphene," which occurs when pressure is applied to the eye, such as when you close your eyes tightly or move them in a certain direction. This pressure can stimulate the retina and create the sensation of light or shadows, even in the absence of external light sources.
Given your description that the shadow appears only when you look to the left after closing your eyes, it may suggest that the position of your eye or the way the vitreous gel interacts with the retina at that moment is causing this visual effect. It’s also worth noting that if you have a history of retinal issues, such as retinal tears or detachment, any new visual symptoms should be taken seriously.

While you report that your vision remains clear and without distortion or color changes, it is still advisable to monitor the situation closely. If the circular shadow persists, increases in size, or is accompanied by other symptoms such as flashes of light, increased floaters, or a sudden loss of vision, you should seek immediate medical attention. These could be signs of more serious conditions, such as retinal detachment, which requires prompt treatment to prevent permanent vision loss.

In the meantime, here are a few recommendations:
1. Avoid Eye Strain: Ensure you are not straining your eyes, especially when using screens or reading. Take regular breaks to reduce fatigue.

2. Stay Hydrated: Proper hydration can help maintain overall eye health.

3. Regular Eye Exams: Continue with regular eye check-ups, especially given your history of myopia and any previous retinal issues. This will help in early detection of any changes in your eye health.

4. Document Changes: Keep a record of when the shadows occur, their duration, and any accompanying symptoms. This information can be valuable for your eye care provider.

In conclusion, while occasional circular shadows can be benign, especially if they are transient and not accompanied by other symptoms, it is essential to remain vigilant. If you notice any changes or if the phenomenon becomes more frequent, do not hesitate to consult with an eye care professional for a thorough examination. Your eye health is paramount, and proactive measures can help ensure that any potential issues are addressed promptly.