If you are consistently seeing quick black shadows passing by in your peripheral vision, there are a few potential reasons for this phenomenon:
Eye-related issues: Sometimes, eye-related problems, such as floaters or other visual disturbances, can cause fleeting dark spots or shadows in the peripheral vision. Floaters are small, semi-transparent particles that float in the vitreous gel inside the eye and cast shadows on the retina. If you are concerned about your eye health, it's essential to consult an eye doctor for a thorough examination.
Migraines or headaches: Some types of migraines or headaches can cause visual disturbances, including shadows or flashes of light in the peripheral vision. If you experience headaches along with these visual phenomena, it's important to discuss this with a healthcare professional.
Fatigue or stress: Lack of sleep, fatigue, or high levels of stress can sometimes lead to visual disturbances and perceived shadows in the peripheral vision.
Neurological issues: In some cases, certain neurological conditions might lead to visual disturbances or illusions. It's essential to discuss any persistent visual symptoms with a healthcare professional to rule out any underlying health concerns.
Other environmental factors: In certain lighting conditions or with rapid movements in the environment, our brain can sometimes interpret these changes as brief shadows in our peripheral vision.
It's important to remember that I am not qualified to diagnose any medical condition, and if you are experiencing persistent or concerning visual symptoms, you should seek advice from a healthcare professional. They can conduct a proper evaluation and provide you with an accurate diagnosis and appropriate recommendations for further investigation or treatment.
Regarding the idea of "spirits," there is no scientific evidence to support the existence of supernatural entities like ghosts or spirits. Such experiences are often attributed to natural explanations or psychological factors. However, if you find yourself feeling distressed or anxious due to these experiences, discussing them with a mental health professional can be beneficial in understanding and coping with any related emotional concerns.