Myasthenia Gravis has the symptoms of diplopia, ptosis & bulbar symptoms (weakness of face & throat muscles) Think of this as it starts in the mind and goes to the ground, so the symptoms are going to be from the top down.
Multiple sclerosis has some of the same s/sx with fatigue and weakness as well as diplopia being main ones.
Progressive weakness that is worse at the day’s end
The client with myasthenia develops progressive weakness that worsens during the day. Visual disturbances, including diplopia is incorrect because it refers to symptoms of multiple sclerosis. Ascending paralysis and loss of motor function is incorrect because it refers to symptoms of Guillain Barre syndrome. Cogwheel rigidity and loss of coordination is incorrect because it refers to Parkinsons disease.