Define distance of distinct vision and provide its range ?

Hint: The minimum distance from the attention at which an object appears to be distinct i.e., a really clear image of the thing is made is named the space of distinct vision. This distance is about $25\,cm$ from the attention.

Complete answer:
The minimum distance from the attention at which an object appears to be distinct i.e., a really clear image of the thing is made is named the space of distinct vision. This distance is about $25\,cm$ from the attention. It's defined because the minimum distance between the attention lens and therefore the object to make a transparent image.

The distance of distinct vision is defined because the reference seeing distance is that the closest someone with "normal" vision can comfortably check out something. it's a reference value. Its range is $25\,cm$ for a traditional eye.

Near point or least distinct vision - it's the space from the eyes up to which eyes can have a transparent vision is named least distinct vision. It's about $25\,cm$ for a traditional healthy eye. Thus adult eyes can see the thing from infinity to $25\,cm$.

Note: Humans have a rather over 210-degree forward-facing horizontal arc of their field of vision , while some birds have an entire or nearly complete 360-degree field of vision.The vertical range of the field of vision in humans is around 150 degrees.