Which condition indicates double vision in a patient?

• A. Anisocoria
• B. Diplopia
• C. Nystagmus
• D. Periorbital

Answer: (B)

The condition that indicates double vision in a patient is known as diplopia. This term comes from the Greek word "diplous," meaning double. Diplopia can occur for various reasons, including misalignment of the eyes, neurological issues, or problems with the eye muscles. It is characterized by seeing one object as two, which can significantly impact a person's ability to see clearly and perform daily activities.

In contrast, anisocoria refers to unequal pupil sizes, nystagmus is characterized by involuntary eye movements that can affect vision and balance, and periorbital pertains to the area surrounding the eyes, which does not directly relate to the symptom of seeing double. Understanding these distinctions helps in recognizing the specific condition described by the term "diplopia."