How is it that light disperses from a point source (like a pinhole w/ a light shining through). From my understanding, photons disperses in all directions at all angles. So than how is it that an eye can differentiate that point from all the other points light around it (say there was another pin hole in a different area of the field of view). Would not the complete dispersal from one point of light hit every photoreceptor cell? And if so, how would it differentiate that stimulus from another point of light? Thanks very much.