Which psychotic disorder is marked by an inability to distinguish reality from fantasy?

The disorder characterized by an inability to distinguish reality from fantasy is schizophrenia. This serious mental health condition is marked by symptoms such as delusions, hallucinations, disorganized thinking, and impaired functioning, which can severely impact one’s ability to differentiate between what is real and what is not. Individuals with schizophrenia may experience vivid hallucinations like hearing voices or seeing things that aren't there, and their beliefs may be based on false perceptions of reality.

Understanding this aspect is crucial because it highlights how schizophrenia fundamentally alters an individual's connection with the world around them, leading to significant challenges in everyday functioning and social interactions. This distinguishes schizophrenia from personality disorders, attention disorders, or obsessive-compulsive disorder, which, while they may have their own debilitating symptoms, do not primarily involve the same profound distortion of reality.