Entering a dark room from a bright area?
Hello doctor, I recently noticed that when I enter a completely dark room from a bright area, my eyes sometimes experience a sensation of flashes or electrical discharges.
However, I just had a fundus examination and optic nerve assessment the day before.
Is this a normal phenomenon related to retinal discharge?
Xiao Xiao, 20~29 year old female. Ask Date: 2020/12/21
Dr. Gao Pilin reply Ophthalmology
Hello, Xiao Xiao: It may be due to vitreous traction causing discharge from the retina.
If recent examinations showed no issues, you can monitor the situation yourself.
However, if the condition worsens, you should seek medical attention for further evaluation.
At Taiwan E-Hospital Puzi Hospital, the ophthalmology department is open on Monday, Tuesday, Thursday, and Friday mornings from 8:00 AM to 12:00 PM, and Wednesday afternoons from 2:00 PM to 4:30 PM.
Please note that online responses are for reference only; it is essential to visit a medical facility if necessary.
I hope to have the opportunity to serve you.
Gao Pi-Lin
Reply Date: 2020/12/21
More Info
Experiencing flashing lights or a sensation of "electric discharges" in your vision when transitioning from a bright environment to a dark one can be concerning. However, this phenomenon is not uncommon and can often be attributed to several physiological processes occurring in the eye and brain.
When you move from a well-lit area to a dark room, your eyes undergo a process known as "dark adaptation." This is where the photoreceptors in your retina, specifically the rods, adjust to the lower light levels. During this adaptation period, it is possible to experience temporary visual disturbances, including flashes of light. These flashes can be caused by the retina being stimulated as it adjusts to the new lighting conditions.
In your case, the sensation of flashing lights could be related to the vitreous gel in your eye pulling on the retina, which is a common occurrence, especially if you have a condition known as vitreous detachment. This happens when the vitreous gel, which fills the eye, begins to shrink and pull away from the retina. If this pulling is significant, it can cause the retina to send signals to the brain that are interpreted as flashes of light. This is often referred to as "photopsia."
It is also important to consider that if you have a pre-existing condition such as floaters (which you mentioned as having "flying mosquitoes"), it could be related to the same vitreous changes. Floaters are tiny clumps of gel or cells that cast shadows on the retina, and they can become more noticeable in different lighting conditions.
If you have recently had a thorough eye examination, including checks of the retina and optic nerve, and no significant issues were found, it is likely that what you are experiencing is a benign phenomenon related to the normal functioning of your visual system. However, if these flashes become more frequent, are accompanied by other symptoms (such as a sudden increase in floaters, loss of peripheral vision, or a curtain-like shadow over your vision), it is crucial to seek immediate medical attention. These could be signs of more serious conditions, such as retinal tears or detachments, which require prompt treatment.
In summary, while experiencing flashes of light when moving from bright to dark environments can be a normal response of the eye adjusting to light changes, it is essential to monitor the frequency and nature of these flashes. If they persist or worsen, consulting with an eye care professional is advisable to rule out any underlying issues. Regular eye exams are crucial for maintaining eye health, especially if you have pre-existing conditions.
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