Snake vision question

Question

ok i have six snakes all in glass aqarium. i know that snakes see heat.

so how do they see me if i walk by? why dont they see the temperature of the glass?

Answer 1

depth perception and they see movement, usually they use smell to lock onto you.

Answer 2

youre thinking of pit vipers, they have pit sensors than can sense the body heat of an animal, which is usually hotter than the enviroment around it.

snakes see in a wide-view, most likely they are color blind, but otherwise see as cats do. (cats can see in color)