What is another term for double vision?

Double vision is medically referred to as diplopia. This term specifically describes the phenomenon where a person sees two images of a single object, which can occur in both horizontal and vertical orientations. Diplopia can manifest due to various underlying causes, such as issues with eye alignment, muscle control, or neurological conditions.

In contrast, binocular vision refers to the ability to focus on an object with both eyes, allowing for depth perception. Monocular vision involves using a single eye to see and is not related to double vision, as it does not result in the perception of multiple images. Visual distortion generally refers to a change in how an object is perceived, without necessarily involving double images, and can be due to various factors, such as refractive errors or other visual impairments. Therefore, the correctness of the answer as "diplopia" aligns directly with its definition as the condition of seeing double.