As far as I know it's ungrammatical to use the verb form "seeing" when perception is involved - do you mean specifically the gerund seeing, or any use of to see? Either way, it sounds wrong to this US English speaker: we use "seeing" to mean "perceiving" all the time.
grammar - When is it ok to use "seeing"? - English Language Learners ...
Idiomatically, What do you see? can also be taken to mean What are you capable of seeing? (As a human being, what do you see?) The answer could be the wavelengths of light observable by the human eye.
On seeing that the robber was walking at his direction slowly, he turned around, and ran for his dear life. Seeing that the robber was walking at his direction slowly, he turned around, and ra...
They're definitely not interchangeable. If you start saying I am seeing instead of I can see, people will notice you're talking like a foreigner. I can't explain how it works grammatically, but Chandler's use of the continuous here serves to convey the question: "do you the same thing I see?" See here for a similar use of see in the present continuous.
present continuous - "I see" vs. "I am seeing" in the sense of ...
2a: We were still seeing each other a couple of times a month when her mother died I've put a question mark against #1a because I'm guessing many people would agree with me it doesn't work if the intended meaning is "at the time when".
tense - Meaning of progressive: “were seeing” vs “saw” - English ...