My question is this: Is it plausible for most aliens to have eyes that are superficially similar to human eyes, given the context below?
The context is this:
- I'm defining "convergent" as being any evolved light-sensing organ that's similar to a mammalian eye. It can have differences (e.g. designed to detect a different spectrum of light), but should be at least superficially similar in design.
- An ancestral species deliberately seeded primitive microbes that evolved into the majority of sentient species, including humans, so there's no need to account for 'unconventional' forms of life. The aliens can be generalized to drink water, inhale oxygen, exhale carbon dioxide, etc.
- Certain environmental conditions can make evolving organs to detect and differentiate light waves less probable, for instance intelligent life that evolved near the ocean floor of a world that receives most of its heat from tidal heating, and is far from its sun, but I'm taking it as a given that most of the seeded worlds were those in their star's normal zone of habitability, and thus the intelligent species evolved on them have evolved some kind of light-sensing organ.