Sudden Black Shadow in Vision: Is It Floaters or Something Else?

Seeing a rapid shadow or flash in the vision?

Hello, I would like to ask the doctor about an experience I had today.
When I turned on the light in the bathroom, I suddenly saw a quick shadow darting out from below my eye, but it disappeared almost immediately.
I'm not sure if it was an issue with my eyes or if I actually saw an insect.
I would like to know if this could be a case of floaters or if there might be another issue causing this problem.
However, my sister has floaters, and she mentioned that what she sees moves very slowly, which is quite different from my description.
She joked that it might have just been an insect flying around.
If I describe this to an ophthalmologist tomorrow, will they be able to perform an examination? Thank you.

Nan, 10~19 year old female. Ask Date: 2020/06/30

Dr. Gao Pilin reply Ophthalmology

Hello,
There are many types of floaters, and your situation could indeed be a case of floaters, but it is also possible that it is a real insect flying by.
You may want to observe the situation further; if it continues to occur, it could be floaters.
If you visit an ophthalmologist, they will certainly perform an examination for you.

In Taiwan, the ophthalmology department at Puzi Hospital is available on the following schedule:
Monday, Tuesday, Thursday, and Friday from 8:00 AM to 12:00 PM, and Wednesday from 2:00 PM to 4:30 PM.

Please note that online responses should only be used as a reference; if necessary, you should seek medical attention at a healthcare facility.
I hope to have the opportunity to assist you.

Best regards,
Gao Pilin

Reply Date: 2020/06/30

More Info

The sudden appearance of a black shadow in your vision can indeed be concerning, and it's understandable that you want to clarify whether this is related to floaters or something else entirely. Based on your description, it seems that you experienced a brief visual disturbance when you turned on the light in the bathroom. This phenomenon could be attributed to several factors, including floaters, but it may also be influenced by other visual or environmental conditions.

Floaters, or "myodesopsia," are small specks or strands that float in your field of vision. They are typically caused by changes in the vitreous humor, the gel-like substance that fills the eye. As we age, the vitreous can shrink and pull away from the retina, leading to the perception of these floaters. They often appear more prominently against bright backgrounds, such as when you turn on a light in a dim room. However, floaters usually move slowly and can be more noticeable when you are looking at a plain, bright surface.

In your case, the quick appearance of a black shadow that disappeared almost immediately could suggest a different issue. It might be related to a transient visual phenomenon, such as a visual migraine or a brief episode of photopsia, which is characterized by flashes of light or shadow in the visual field. These occurrences can happen due to various reasons, including changes in blood flow to the retina or even a reaction to sudden changes in lighting conditions.

It's also worth considering that your sister's experience with floaters differs from yours. While floaters can vary in appearance and movement from person to person, the rapid shadow you described does not align with typical floater behavior. Your sister's observation of slow-moving floaters suggests that her experience is more consistent with the common characteristics of floaters.

If you are concerned about your vision, especially since you experienced a sudden change, it is advisable to consult with an eye care professional. When you visit the ophthalmologist, be sure to describe your symptoms in detail, including the suddenness of the shadow, its duration, and any other visual disturbances you may have experienced. The doctor will likely perform a comprehensive eye examination, which may include a dilated fundus exam to assess the health of your retina and vitreous.

In summary, while floaters are a common and usually benign phenomenon, the sudden appearance of a black shadow in your vision warrants further investigation. It could be related to floaters, but it may also indicate other visual disturbances. Seeking a professional evaluation will provide you with clarity and peace of mind regarding your eye health. Remember, early detection and intervention are key in addressing any potential issues with your vision.

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