Persistent Light Sensation in Closed Eyes: Causes and Insights - Ophthalmology

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The phenomenon you are experiencing, where you perceive a faint light sensation in the upper left corner of your closed left eye, can be attributed to several potential causes. This condition is often referred to as "phosphene," which is the perception of light without light actually entering the eye. Phosphenes can occur due to various reasons, including mechanical stimulation of the retina, pressure on the eyeball, or even spontaneous activity in the visual cortex of the brain.

In your case, given that you have been experiencing visual fatigue, it is possible that your symptoms are related to eye strain. Prolonged use of digital devices, reading, or any activity that requires intense focus can lead to visual fatigue, which may manifest as discomfort, blurred vision, or unusual visual sensations, such as the faint light you are describing. This is particularly relevant for individuals with high myopia, as the structural changes in the eye can make them more susceptible to visual disturbances.

Another potential cause for your symptoms could be related to the vitreous body, which is the gel-like substance that fills the eye. In individuals with high myopia, the vitreous can undergo changes that may lead to traction on the retina, resulting in visual phenomena such as flashes of light or persistent light sensations. Although you mentioned that you have not experienced any significant issues during your recent eye examinations, it is essential to continue monitoring your symptoms, especially if they persist or worsen.

Additionally, the presence of visual phenomena when your eyes are closed could also indicate a heightened sensitivity of your visual system. This can occur due to fatigue, stress, or anxiety, which can amplify your perception of visual stimuli, even in the absence of actual light. The brain continues to process visual information even when the eyes are closed, and this can lead to the perception of light or patterns.

To address your concerns, it is crucial to prioritize eye health and take preventive measures. Here are some recommendations:
1. Rest Your Eyes: Implement the 20-20-20 rule, which suggests that for every 20 minutes of screen time, you should look at something 20 feet away for at least 20 seconds. This helps reduce eye strain.

2. Limit Screen Time: Try to reduce the amount of time spent on digital devices, especially before bedtime. Consider using blue light filters on screens to minimize eye fatigue.

3. Maintain Proper Lighting: Ensure that your workspace is well-lit to reduce glare and strain on your eyes. Avoid reading in dim light.

4. Stay Hydrated: Drink plenty of water to keep your body and eyes hydrated, which can help alleviate symptoms of dry eyes and fatigue.

5. Regular Eye Check-ups: Continue to have regular eye examinations to monitor your eye health, especially given your history of high myopia. If your symptoms persist or worsen, seek further evaluation from an eye care professional.

6. Manage Stress: Engage in relaxation techniques such as deep breathing, meditation, or yoga to help reduce stress, which can contribute to eye strain and discomfort.

In conclusion, while the faint light sensation you are experiencing can be concerning, it is often a benign phenomenon related to eye strain or changes in the vitreous. However, it is essential to remain vigilant and consult with your eye care provider if your symptoms persist or if you notice any new visual disturbances. Your proactive approach to monitoring your symptoms and seeking medical advice is commendable and will contribute to maintaining your eye health.