Conscious understanding of something.
That which is detected by the five senses; not necessarily understood (imagine looking through fog, trying to understand if you see a small dog or a cat); also that which is detected within consciousness as a thought, intuition, deduction, etc.
Vision (ability)
The organisation, identification and interpretation of sensory information.
Acuity
Knowledge of the future; understanding of something in advance, especially as a form of supernatural or extrasensory perception.
The practice of taking a factual statement from a witness before a trial.