Visible horizons refer to the limit of one's sight or perception. There are several synonyms for this phrase, including visible distance, visual range, visible panorama, visible extent, and visible limits. These phrases all refer to what one can see or perceive with their eyes, whether it's a physical object or an abstract concept. Other related terms include observable boundaries, detectable perimeters, and discernible limits. These synonyms can be used interchangeably to describe the extent of one's view or knowledge, whether it's in the physical world or in the abstract realm of ideas and concepts.