A patient with Parkinson's disease cannot eat properly, his prosthesis keeps dislodging, and he shows lingual thrust. Which finding would you NOT expect in this patient?

Correct answer: A. Vision loss

• A. Correct. Vision loss is not a cardinal feature of Parkinson's disease. The classic motor tetrad is tremor, rigidity, bradykinesia, and postural instability.
• B. Resting ('pill-rolling') tremor is a hallmark sign — expected.
• C. Cogwheel rigidity is a core motor sign — expected.
• D. Bradykinesia (slowness of movement) is a defining feature — expected, and explains the eating/prosthesis difficulty.