text: Yo, listen up, I got a chapter to drop,
  Talkin' 'bout visual problems in Parkinson's, nonstop.
  PD, parkinsonian syndromes, gotta differentiate,
  Visual signs, let me illuminate.
  
  In PD, the vision can take a hit,
  Acuity, contrast, colors, all of it.
  Pupil reactivity, eye movements, no joke,
  Motion perception, visual fields, we spoke.
  
  Visuospatial orientation can be disturbed,
  Facial recognition, it's a problem observed.
  REM sleep behavior, visual hallucinations arise,
  In PD, they're no surprise.
  
  Pupil reactivity, stereopsis, pursuit eye movement,
  Accompanied by REM sleep, it's a clue, a movement.
  Early features of PD, they might be,
  Visuomotor adaptation, yeah, you see.
  
  Dementia with PD, eye movement enhanced,
  Visuospatial deficits, hallucinations danced.
  Visual dysfunction, a diagnostic key,
  Distinguishing PD from other symptoms, you see.
  
  Visual hallucinations, saccadic problems, they tell,
  Discriminating features, they know it well.
  So when it comes to PD and its visual signs,
  We're on the lookout, separating the lines.