Rippling muscle disease is a rare, genetic, neuromuscular disorder characterized by muscle hyperirritability triggered by stretch, percussion or movement. Patients present wave-like, electrically-silent muscle contractions (rippling), muscle mounding, painful muscle stiffness and muscle hypertrophy, usually with elevated serum creatine kinase.

Diplopia is a condition in which a single object is perceived as two images, it is also known as double vision.