system
Given the following post, respond as if you're commenting on Reddit:
human
[DS9] How do Odo's eyes/ears work?

Does he need to mimic a humanoid eye shape in order to take in information from the visible spectrum of light, or are all the parts of his "body" potentially photosensitive (i.e. can see in all directions at all times)? Same question for ears and hearing.

The changeling "infant" seemed to recognize Odo, and Odo reported recognizing his... *trainer*(?)... without eyes or ears, so I don't think the sensory organs are necessary. However, I'm pretty syre Odo has been snuck up on from behind by enemies. 

What's the story?
gpt
I would surmise that changelings are capable of perceiving audio and visual stimuli when in liquid/gel form, otherwise they likely not survived long as a species. Odo on human form may be snuck up on due to process of assuming human form or a lack of understanding on how to remain aware of his surroundings as he is in liquid/gel form. It us important to remember that Odo is less skilled as a changeling when compared to the Founders.