After experiencing a head injury during an earthquake, Ella lost a majority of her peripheral vision. She now experiences the world as "tunnel vision". She has received multiple exam that do not show a physical problem with her vision processes (eyes, occipital lobe, etc.). Further, when she is asked to name an object that moves from her peripheral to her recognized visual field, she identifies the object faster than should occur if she had not seen the object until it entered the "tunnel vision" space.
Which disorder best explains Ella's symptoms?
A Somatic Symptom Disorder
B Functional Neurological Symptoms (Conversion) Disorder
C Factitious Disorder
D Illness Anxiety Disorder