visual angle

Some51 hold that distant objects seem to us lesser only because they are seen under a smaller visual angle.

The visual angle of an object is the angle at the eye lens between the rays that have come from the ends of the object.

It may be safely said that the field or "visual angle" of the unaided eye for distinct vision is at least 45° in all directions.

By this arrangement a visual angle is secured, and all objects lying within it are distinctly visible at the same time.

Nor would it be impossible to reduce, now, under the definite visual angle of materialism, the whole of ancient Roman history.