Night Vision Issues: Why Does Darkness Affect My Eyes? - Ophthalmology

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Night vision issues can be quite concerning, especially when they manifest as dark spots or changes in visual perception in low-light conditions. Based on your description, it seems that you are experiencing a phenomenon that could be related to several factors, including the physiological responses of your eyes to darkness, potential fatigue, and the effects of high myopia (nearsightedness).

When you turn off the lights and enter a dark environment, your eyes undergo a process called "dark adaptation." This is when the photoreceptors in your retina, particularly the rod cells, adjust to the lower light levels. Rods are responsible for vision in dim light, and they take time to become fully functional in darkness. If you notice a dark area in your vision that seems to expand and then disappear after a few minutes, it could be a temporary effect of your eyes adjusting to the lack of light. This is generally a normal physiological response, especially if it resolves after a short period.

However, you mentioned that this dark area seems to be increasing in size compared to a few months ago. This could indicate a few possibilities. One is that your eyes may be experiencing fatigue, particularly if you have been using them for extended periods without adequate rest. Eye strain can lead to temporary visual disturbances, including blurred vision or dark spots, especially in low-light conditions. Ensuring that you take regular breaks and practice good eye hygiene can help alleviate these symptoms.

Another consideration is your high degree of myopia. Individuals with significant myopia may have a higher risk of developing retinal issues, including retinal detachment or degeneration. While your recent eye examinations may not have indicated any immediate problems, it is essential to monitor any changes in your vision closely. If you notice that the dark area persists or worsens, or if you experience other symptoms such as flashes of light or an increase in floaters, it would be prudent to consult with an eye care professional for a comprehensive evaluation.

Additionally, the phenomenon of seeing a dark area that expands and contracts could also be related to the way your brain processes visual information in low light. Sometimes, the brain may misinterpret signals from the retina, especially if the rods are not fully adapted to the dark. This can create the sensation of dark spots or areas in your field of vision.

In summary, while the symptoms you are experiencing could be related to normal physiological responses to darkness and eye fatigue, it is crucial to remain vigilant, especially given your history of high myopia. Regular eye check-ups and open communication with your eye care provider about any changes in your vision are essential for maintaining your eye health. If you have concerns about your night vision or any other visual disturbances, do not hesitate to seek professional advice.