What term refers to a blind area of reduced vision in the visual field?

The term that refers to a blind area of reduced vision in the visual field is "scotoma." A scotoma can occur in various eye conditions, such as glaucoma or retinal diseases, and is characterized by a specific region in the visual field where vision is diminished or absent. This can affect a person's ability to see objects in that particular area, which can be significant in everyday activities.

In contrast, astigmatism is a refractive error caused by an irregular shape of the cornea, leading to blurred or distorted vision. Diplopia, commonly known as double vision, occurs when a person sees two images of one object, which may happen due to muscle control issues or nerve problems. Myopia, or nearsightedness, is another refractive error where distant objects appear blurry while close objects can be seen clearly. Each of these terms refers to different visual impairments or conditions rather than a specific blind area in the visual field, making "scotoma" the appropriate choice for this question.