Final answer:
Synesthesia is the best example of normal visual sensation in the absence of complete visual perception.
Step-by-step explanation:
The normal visual sensation in the absence of complete visual perception is best illustrated by synesthesia. Synesthesia is a condition where stimulation of one sensory or cognitive pathway leads to automatic and involuntary experiences in another sensory or cognitive pathway. In the case of visual synesthesia, individuals may see colors, shapes, or patterns when they hear certain sounds, taste certain foods, or think about certain concepts.