Regarding your description of hallucinations, it is true that hallucinations can involve not seeing something that is actually there, or seeing something that isn't present in reality. This can happen in various mental health conditions or under the influence of certain substances.
However, it's important to differentiate between hallucinations and normal cognitive processes like temporary memory lapses or visual distractions. Misplacing your keys and then finding them later is a common experience for many people and is typically not considered a hallucination.
Similarly, not seeing another car or pedestrian while driving can be dangerous and is related to attention, focus, and situational awareness, rather than hallucination. It's crucial to be vigilant and attentive while driving to ensure the safety of oneself and others on the road.
If you are concerned about your experiences, such as frequent memory lapses or visual distractions, it's best to consult with a healthcare professional for a proper evaluation and advice tailored to your specific situation.