Floaters: What Do Dark Shadows in Your Vision Mean? - Ophthalmology

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Floaters, or "flying spots," are common visual phenomena that many people experience, particularly as they age. They appear as small shadows or shapes that drift across your field of vision, often more noticeable against bright backgrounds. The presence of floaters is typically associated with changes in the vitreous gel that fills the eye, which can become more liquid and less gel-like over time, leading to the formation of these shadows.

In your case, the description of a "very black block" appearing in your vision, particularly in dim lighting, raises some important considerations. While floaters can manifest as small dots or lines, they can also appear as larger shapes or shadows, especially if there is a significant change in the vitreous gel or if there is a detachment occurring. The fact that you are experiencing this phenomenon in both eyes, along with your history of myopia (nearsightedness), is relevant. High myopia can increase the risk of retinal issues, including retinal tears or detachments, which can present with new floaters or shadows in your vision.

The intermittent nature of your symptoms—occurring about four times a day and lasting for approximately two seconds—suggests that it may be related to the dynamics of the vitreous gel rather than a constant retinal issue. However, the appearance of a new, dark shadow in your vision, especially if it is different from your usual floaters, warrants further investigation. It is crucial to differentiate between benign floaters and potential signs of more serious conditions, such as retinal detachment or hemorrhage.

Given your high degree of myopia and the recent changes in your vision, it is advisable to consult with an eye care professional for a comprehensive examination. They may perform a dilated eye exam to assess the health of your retina and vitreous gel. This examination can help rule out any serious conditions and provide peace of mind.
In summary, while your symptoms may be related to floaters, the specific characteristics of the dark shadow you described, combined with your myopic history, suggest that a thorough evaluation is necessary. Early detection of any potential retinal issues is critical in preserving vision and preventing complications. Therefore, I recommend scheduling an appointment with an ophthalmologist to ensure your eye health is thoroughly assessed.