What medical term describes a state of dullness or dimness in vision?

The medical term that describes a state of dullness or dimness in vision is indeed "Ambly/o." This term comes from the word "amblyopia," which is commonly referred to as "lazy eye." Amblyopia is a vision development disorder where the affected eye fails to achieve normal visual acuity, often resulting in a dull or dim perception of visual stimuli.

The other terms relate to different visual conditions: "Scotoma" refers to a partial loss of vision or a blind spot in an otherwise normal visual field. "Hyperopia" is a condition also known as farsightedness, where distant objects can be seen clearly, but close objects are blurry. "Astigmatism" is a refractive error caused by an irregularly shaped cornea or lens, leading to distorted or blurred vision at all distances. Understanding these distinctions is important for recognizing various visual impairments.