A patient reports seeing a small, brightly coloured figure standing in the corner of an otherwise empty room, describing it with the same full perceptual vividness as anything else she looks at, though nothing is actually there. Before revealing the answer: is this chromatopsia?

No, this is more consistent with a visual hallucination than with chromatopsia. Chromatopsia involves a genuine external scene being viewed throughout, with only its overall colouring altered; here, an entire figure is being perceived with no real object present at all, which is the defining pattern of a visual hallucination rather than a colour distortion of something genuinely being looked at.