Comprehensible observation of the biochemical reaction that permit us to see

Biochemical molecules are so complex that it would require far too much computer power to realistically predict how their molecular structures come to fold in a particular way — and thus acquire their functionalities — after reactions sparked by photon impacts. Instead, physicists use simpler, approximate models to understand the effects of incoming photons on the microscopic components of complex molecules.

What makes it possible for our eyes to see? It stems from a reaction that occurs when photons come into contact with a protein in our eyes, called rhodopsin, which adsorbs the photons making up light. 

The incoming photon triggers certain reactions, which can result, over time, in dramatic changes in the properties of the molecule itself.