Second sight and Third eye

Second sight noun - The power of seeing or knowing about things that are not present to the senses.

Third eye and second sight are semantically related. in extrasensory perception topic. In some cases you can use "Third eye" instead a noun phrase "Second sight".

Third eye noun - A sensory structure capable of light reception located on the dorsal side of the diencephalon in various reptiles.

Second sight and third eye are semantically related. Sometimes you can replace phrase "Second sight" with "Third eye", this phrases are similar.