Flashes of Light When Eyes Are Closed: Eye Symptoms - Ophthalmology

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Flashes of light when your eyes are closed can be concerning, especially for someone with a history of floaters (known as "myodesopsia"). Your experience of seeing flashes or shadows when you move your head or eyes, particularly with your eyes closed, can be attributed to several factors related to the structure and function of the eye.

Firstly, it’s important to understand that the eye is filled with a gel-like substance called vitreous humor. As we age, this vitreous can become more liquid and may pull away from the retina, leading to the sensation of floaters and flashes. The flashes you are experiencing, particularly when you move your eyes or head, may be due to the vitreous tugging on the retina. This is often benign, especially if the flashes are brief and do not persist.

The phenomenon you describe, where you see flashes or shadows when your eyes are closed, can also be related to the pressure applied to the eyeball. When you press on your eyes, even gently, it can stimulate the retina and create the sensation of light or flashes. This is known as "phosphene," which is a visual sensation that occurs without light entering the eye. It’s a normal response of the retina to mechanical stimulation.

However, it’s crucial to differentiate between benign symptoms and those that may indicate a more serious condition. While flashes and floaters are common and often harmless, they can sometimes signal retinal issues, such as retinal tears or detachment, particularly if there is a sudden increase in the number of floaters or flashes, or if they are accompanied by other symptoms like a shadow or curtain over your vision.

Given your history of floaters and the recent changes in your visual symptoms, it is advisable to consult with an eye care professional for a comprehensive examination. They may perform a dilated eye exam to check the health of your retina and vitreous. This is especially important if you notice any new symptoms or changes in your vision.

In summary, while the flashes you are experiencing when your eyes are closed and during movement may be related to the normal aging process of the vitreous and the retina, it is essential to monitor these symptoms closely. If they worsen or if you experience any additional symptoms, such as a sudden increase in floaters, changes in your peripheral vision, or any other visual disturbances, seek medical attention promptly. Regular eye exams are crucial for maintaining eye health, especially for individuals with a history of floaters or other eye conditions.