White Light in the Corner of the Eye After Sleep - Ophthalmology

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The phenomenon of seeing white light in the corner of the eye, especially when lying down and closing your eyes, can be attributed to several factors related to the eye's anatomy and physiology. Given your history of myopia (nearsightedness) and astigmatism, it is essential to consider how these conditions might interact with the visual sensations you are experiencing.

Firstly, the appearance of white light in the corner of your eye when you close your eyes could be related to the vitreous body, which is a gel-like substance that fills the eye. As we age or due to certain conditions, the vitreous can undergo changes, such as liquefaction or detachment from the retina. When you lie on your side, the gravitational pull may cause the vitreous to shift slightly, leading to sensations of light or flashes, particularly if it is pulling on the retina. This is often benign but can sometimes indicate more serious conditions, such as vitreous detachment or retinal issues, especially in individuals with high myopia.

The fact that the white light disappears when you move your eyes suggests that it may be related to the mechanical movement of the vitreous or the way light is refracted in your eye. When you change your head position or eye movement, the dynamics of the vitreous and the retina change, which can lead to the temporary disappearance of these visual phenomena.

Additionally, the use of your phone before bed could also play a role. Prolonged exposure to screens, especially in low-light conditions, can lead to visual fatigue and temporary disturbances in vision, including afterimages or visual artifacts. This is often referred to as "visual snow" or "entoptic phenomena," where you perceive light or shapes that are not present in the external environment.

It's also worth noting that the brain processes visual information even when the eyes are closed. The phenomenon you describe could be a form of "visual persistence," where the aftereffects of light exposure linger in your visual field. This is particularly common after looking at bright screens or lights.

In summary, while the appearance of white light in the corner of your eye when lying down is likely benign and related to the vitreous or the effects of light exposure, it is essential to monitor the situation. If you experience any changes in your vision, such as an increase in the frequency or intensity of these light sensations, or if you notice other symptoms like flashes of light, floaters, or a shadow in your vision, it would be prudent to consult with an eye care professional. Regular eye examinations are crucial, especially for individuals with myopia, to ensure that any potential issues are identified and managed appropriately.