Intution Vision as opposed to Hallucination, illusion and imagination

In olden days, in the absense of sensory mechanisms as are available in these days, many of us believed that great saints, hermits, sadhus, sanyasis and devotees use to train their minds and senses so as to use them to become poweful mechanisms for the perceptions of the micro and macro level objects and use to name such mental and sensory organs power as intuition, vision etc, which a moderm educated described it as imagination, illusion, hallusination etc etc.

With ones personal experience even in modern times, to some extent, such things are possible for those who by constant traiing and concentration and by yoga excercises, meditation make their mind, sensory organs and body as a powerful mechanism of perception and for the modern educated it may look as hallucination, illusion or imagination as opposed to reality.