No, you are not crazy. Experiencing fleeting shadows or visual phenomena can be relatively common and is not necessarily a sign of a mental health issue. There are several potential explanations for such experiences:
Visual Persistence: Sometimes, when you stare at an object for a prolonged period, your brain can retain an afterimage of that object even after you blink or look away. This could be the cause of seeing a shadow when you blink.
Eye Fatigue: Strained or tired eyes can lead to visual disturbances, including fleeting shadows or spots.
Eye Floaters: Eye floaters are tiny specks or strings that drift across your field of vision. They are caused by small clumps of gel or cells inside the vitreous, the gel-like fluid that fills the eye.
Low Lighting Conditions: In dim lighting, your eyes might be more sensitive, causing you to perceive shadows or shapes that may not be present.
Visual Illusions: The brain can sometimes misinterpret visual input, leading to the perception of shadows or shapes that are not actually there.
Stress and Anxiety: Stress and anxiety can sometimes lead to heightened perceptions and sensory experiences, potentially causing you to notice things that you might not have noticed otherwise.
If you are concerned about these experiences, it's always a good idea to discuss them with a healthcare professional, especially an eye doctor or an optometrist. They can conduct a thorough examination to check for any underlying eye conditions that might be contributing to these visual phenomena.
Additionally, if you are experiencing other symptoms or if these experiences are significantly impacting your daily life or causing distress, it's essential to speak with a mental health professional. They can help you explore any emotional or psychological factors that might be influencing your perceptions and provide appropriate support and guidance.
Remember that seeking help and clarification about your experiences is a responsible and healthy approach to addressing any concerns you may have. It's better to seek professional advice to rule out any potential issues and gain peace of mind.