Temporary Darkening of Vision: Causes and Concerns

Darkening of the visual field?

In the past few days, my vision occasionally becomes inexplicably dark for a brief moment (about a few seconds), similar to a flickering light, especially when I sleep with a night light on; it seems to occur every few seconds.
However, it seems to disappear in the morning.
I had a dilated eye exam a month ago, and the doctor found no issues.
Additionally, I underwent retinal laser treatment a year ago, so it shouldn't be a retinal problem, right? If it's not an eye issue, could it be a neurological problem? But I'm still young.
I used to experience this occasionally, but it has become much more frequent lately, especially at night.
Could it be eye fatigue? This is very concerning for me.
Thank you for your response, doctor.

bái, 20~29 year old female. Ask Date: 2021/08/21

Dr. Gao Pilin reply Ophthalmology

Hello, regarding the issue, it is likely unrelated to the laser.
Vision tends to be poor in low light conditions, which may be due to the physiological metabolism of the retina.
The dilation and constriction of the pupil, as well as the contraction of the ciliary muscle, could also contribute to this phenomenon.
Fatigue may also play a role.
In summary, if the examination showed no issues, you should feel reassured.

Reply Date: 2021/08/21

More Info

The temporary darkening of vision that you are experiencing, often described as a flickering or momentary blackout, can be concerning, especially when it occurs frequently and is more pronounced in low-light conditions. Based on your description, there are several potential causes for this phenomenon, and understanding them can help alleviate some of your fears.

1. Visual Adaptation: One common reason for temporary darkening of vision, especially in dim lighting, is the eye's adaptation process. When you transition from bright to dark environments, your eyes need time to adjust. This adjustment involves the dilation of pupils and the activation of rod cells in the retina, which are responsible for low-light vision. If this process is disrupted or if you are fatigued, it can lead to brief moments of visual disturbances.

2. Eye Fatigue: Prolonged use of screens or focusing on a single point can lead to eye strain or fatigue, which may manifest as temporary visual disturbances. Symptoms of eye fatigue can include blurred vision, dry eyes, and even temporary darkening of vision. If you spend long hours in front of a computer, it is essential to take regular breaks, practice the 20-20-20 rule (every 20 minutes, look at something 20 feet away for 20 seconds), and ensure proper lighting to reduce strain.

3. Retinal Issues: Although you mentioned that you had a thorough examination and treatment for retinal issues, it is still essential to consider that certain retinal conditions can cause transient visual disturbances. For example, if you have had previous retinal laser treatments, it is crucial to monitor for any new symptoms, as changes in the retina can sometimes lead to flickering or darkening of vision.

4. Neurological Factors: While it is less common, temporary visual disturbances can also be related to neurological issues. Conditions such as migraines can cause visual auras, which may include flickering lights or temporary darkening of vision. Even if you are young, it is possible to experience these symptoms, especially if you have a history of migraines or if you are under significant stress.

5. Psychological Factors: Anxiety and stress can also manifest physically, including in your vision. If you are feeling anxious about your vision or health, this can exacerbate your symptoms. It is essential to address any underlying anxiety, as it can significantly impact your overall well-being.

Given that you have already undergone a thorough examination and your doctor found no significant issues, it may be beneficial to keep a symptom diary. Note when these episodes occur, their duration, and any accompanying symptoms. This information can be valuable for your healthcare provider if you decide to seek further evaluation.

In conclusion, while temporary darkening of vision can be alarming, it is often related to benign causes such as visual adaptation, eye fatigue, or even psychological factors. However, if these episodes persist, worsen, or are accompanied by other concerning symptoms (such as headaches, visual loss, or other neurological signs), it is crucial to seek further evaluation from an eye care professional or a neurologist. Regular check-ups and open communication with your healthcare provider will help ensure that any potential issues are addressed promptly.

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