The organisation, identification and interpretation of sensory information.
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)
Conscious understanding of something.
Acuity
The taking of a small amount of food or drink into the mouth in order to taste it.
A small amount of food or drink.