Final answer:
Diplopia is the term used to describe double vision, where a person sees two images of a single object. It is distinct from hyperopia (farsightedness) and myopia (nearsightedness) which affect vision clarity.
Step-by-step explanation:
The term for double vision is d) Diplopia. When a person experiences diplopia, they see two images of a single object, which may be side by side, one on top of the other, or a combination of both. This condition can occur due to a variety of reasons, including misalignment of the eyes (strabismus), eye muscle paralysis, a palsy of a cranial nerve, refractive surgery, lens dislocation, or brain injuries. Unlike hyperopia (farsightedness) or myopia (nearsightedness), which affect the clarity of vision at different distances, diplopia specifically refers to the perception of two images.