one image confuses the other, and this confusion hinders the pupil from distinguishing the edge.
231.
The outlines of objects will be least clear when they are nearest to the eye, and therefore remoter outlines will be clearer. Among objects which are smaller than the pupil of the eye those will be less distinct which are nearer to the eye.
On indistinctness at great distances (232-234).
232.
Objects near to the eye will appear larger than those at a distance.
Objects seen with two eyes will appear rounder than if they are seen with only one.
Objects seen between light and shadow will show the most relief.
233.
OF PAINTING.
Our true perception of an object diminishes in proportion as its size is diminished by distance.
234.
PERSPECTIVE.
Why objects seen at a distance appear large to the eye and in the image