Circular Shadows in Vision: Causes and Concerns - Ophthalmology

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The phenomenon of circular shadows in vision, particularly in the context of existing conditions like floaters and myopia, can be concerning. Based on your description, it seems that you are experiencing a type of visual disturbance that could be attributed to several factors related to your eye health.

Firstly, the presence of floaters, which are small specks or strands that drift through your field of vision, is a common occurrence, especially in individuals with myopia (nearsightedness). Floaters are typically caused by changes in the vitreous gel that fills the eye, which can become more liquid and allow tiny fibers to clump together, casting shadows on the retina. This is a benign condition, but it can be more noticeable in bright light or when looking at a plain background.

The circular shadow you describe, which moves with your gaze, could be a residual effect of these floaters. When you blink or squint, the movement of the vitreous gel can cause these shadows to shift, leading to the perception of a circular shadow in your central vision. This is often referred to as a "visual artifact" and is usually not a cause for alarm unless accompanied by other symptoms, such as flashes of light, sudden increase in floaters, or a significant change in vision.

Another possibility is that the circular shadow could be related to the way light is refracted in your eye due to your myopia. High degrees of myopia can lead to changes in the shape of the eyeball, which can affect how light enters and is focused on the retina. This can sometimes result in visual distortions, including halos or shadows, particularly in low-light conditions or when looking at bright lights.

Additionally, while you mentioned that the Amsler grid test did not reveal any distortion or dark spots, it is still important to consider the health of your retina. Conditions such as retinal thinning or degeneration can lead to visual disturbances, and while your current symptoms may not indicate a serious issue, it is essential to monitor any changes in your vision closely.

Given your concerns and the presence of myopia and floaters, it would be prudent to follow up with your eye care professional. They can perform a comprehensive eye examination, including a dilated fundus exam, to assess the health of your retina and vitreous. If necessary, they may also recommend imaging tests such as Optical Coherence Tomography (OCT) to get a clearer picture of the structures within your eye.

In summary, the circular shadows you are experiencing are likely related to your existing floaters and myopia. However, it is crucial to maintain regular check-ups with your eye doctor to ensure that your eye health is monitored and to address any new symptoms that may arise. Keeping an eye on your vision changes and seeking timely medical advice is the best approach to managing your eye health.