You're likely seeing phosphenes, which are visual phenomena that can appear as light patterns or shapes when your eyes are closed. The sensation of seeing "eyes" specifically is likely your brain interpreting random phosphene patterns in a way that resembles familiar shapes. Here's a breakdown of the common causes:
What are Phosphenes?
Phosphenes are the sensation of seeing light without light actually entering your eye. They are produced by the eye or brain itself.
Common Causes of Phosphenes:
- Mechanical Stimulation: Rubbing your eyes, even gently, can stimulate the retinal cells and create phosphenes. The pressure triggers these cells, leading to the perception of light.
- Internal Eye Activity: Even without external stimuli, the neurons in your retina and visual cortex are never completely silent. Their random firings can be interpreted as light patterns, which your brain may interpret as familiar shapes such as "eyes".
- Blood Pressure Changes: Coughing or changes in blood pressure can also stimulate the retina and cause phosphenes.
- Migraines: Some people experience phosphenes as part of a migraine aura. These phosphenes can appear as flashing lights, zigzag lines, or other visual disturbances.
- Medications: Certain medications can also cause phosphenes as a side effect.
When to Be Concerned:
While phosphenes are usually harmless, they can sometimes indicate a more serious underlying condition. Consult a doctor if you experience:
- Sudden onset of phosphenes: Especially if accompanied by other symptoms like headache, dizziness, or vision loss.
- Persistent phosphenes: Phosphenes that don't go away after a short period.
- Phosphenes after head trauma: This could be a sign of a concussion or other head injury.
- Phosphenes accompanied by pain: Eye pain, headaches, or other types of pain.
In summary, seeing "eyes" when you close your eyes is most likely due to phosphenes, caused by various factors like pressure on your eyeballs, random nerve firings, or changes in blood pressure. While usually harmless, pay attention to accompanying symptoms and consult a doctor if you have concerns.
