Fixed Black Shadows in Your Vision: Causes and Concerns

There is a fixed vertical shadow in the center of the right eye?

Hello Doctor: I have a history of dry eye syndrome.
On the morning of October 9th, after just waking up, I was lying down in a dimly lit room and looked at my phone for about 5 minutes to check the time.
After turning off my phone, I immediately sat up and noticed a fixed vertical shadow obstructing my vision in my right eye.
I blinked about 4 to 5 times, and the vertical shadow disappeared.
I would like to understand what could cause this situation and whether it is serious.
I am feeling quite anxious and sincerely request your assistance in clarifying this matter.
Thank you very much.

Youna, 40~49 year old female. Ask Date: 2021/10/11

Dr. He Jianxian reply Ophthalmology

It is difficult to determine the nature of the images you are seeing; it is possible that they are afterimages.
If the images disappear on their own, they typically do not pose any significant issues.
This is for your reference.
Dr.
Ho Chien-Hsien, Ophthalmology Department, Nantou Hospital.

Reply Date: 2021/10/11

More Info

The experience of seeing fixed black shadows in your vision, especially after a period of low light and then transitioning to a brighter environment, can be concerning. Based on your description, it seems you may be experiencing a phenomenon related to your dry eye condition, as well as potential visual disturbances that can occur in low-light situations.

Firstly, dry eye syndrome can lead to various visual disturbances. When your eyes are dry, the tear film that normally keeps your eyes lubricated and clear can become unstable. This instability can cause temporary blurriness or visual artifacts, such as shadows or spots. When you blink, the tear film is replenished, which may explain why the black shadow disappeared after you blinked several times.

The fixed black shadow you described could also be related to a condition known as "floaters." Floaters are small clumps of gel or cells that form in the vitreous humor of the eye. They can appear as spots, threads, or shadows that drift across your field of vision. They are more noticeable in low light or when looking at a plain background, such as a wall or the sky. However, if these floaters suddenly change in number or appearance, or if you experience flashes of light, it is crucial to seek medical attention, as these could be signs of retinal detachment or other serious conditions.

Another possibility is that the phenomenon you experienced could be related to the way your eyes adjust to changes in light. When you were lying in a dark room and then suddenly sat up, your eyes may have had difficulty adjusting to the new lighting conditions. This can lead to temporary visual disturbances, including seeing shadows or spots. This is often a normal response of the visual system, but if it occurs frequently or is accompanied by other symptoms, it warrants further investigation.

Given your history of dry eyes, it is essential to manage this condition effectively. Regular use of artificial tears can help maintain a stable tear film and reduce symptoms. Additionally, ensuring that you take breaks when using screens, especially in low-light conditions, can help alleviate eye strain and discomfort.

In conclusion, while the fixed black shadow you experienced may not be an immediate cause for concern, it is essential to monitor your symptoms. If you notice any changes in your vision, such as an increase in the number of floaters, flashes of light, or if the shadows persist, it is advisable to consult with an eye care professional for a comprehensive examination. Early detection and management of any underlying conditions are crucial for maintaining good eye health.

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