In-Universe Explanations:
* Cybertronian Design: In the Transformers universe, Cybertronian bodies are incredibly advanced. Some characters, like Shockwave, might have unique designs with single eyes or other deviations from the "typical" humanoid form. This could be related to their specific role and abilities.
* Injury: It's possible that Shockwave lost his second eye during a battle or accident. His robotic nature suggests he could have received a cybernetic replacement, but chose a single eye for visual clarity or some other functional advantage.
* Strategic Purpose: Having a single eye in the middle of his forehead might serve as a deterrent, giving him a more imposing and intimidating appearance. It could also be a deliberate design choice to enhance his focus and concentration, essential for his scientific work.
Out-of-Universe Explanations:
* Distinguishable Design: A single eye makes Shockwave stand out from other Transformers, adding to his unique and memorable design.
* Symbolic Meaning: The single eye can be interpreted as a symbol of focus, intellect, and a cold, calculating nature, all qualities associated with Shockwave.
Ultimately, the exact reason for Shockwave's single eye is left open to interpretation, but it's a striking feature that adds to his character and the overall complexity of the Transformers universe.