How Nature was able to understand what we need.

[downbeatplumb]

This question may sound "dumb" for some people, but the fact is, there is no stupid question.

The fact is I didn't learn about the theory of Evolution in school because I grew up in a Muslim country where teaching Evolution for what it is, is next to impossible. The books about the theory are either banned, or people don't dare look for them (you think you guys in America have it bad, try to go where I grew up and let's see what you think after). I'm planning however on taking a class on Biology or Evolutionary Biology at some point during my undergraduate degree (thankfully now I live in a Western developed country). So what I know so far about the theory is mostly by documentaries and a few books here and there, but not enough to give me the full picture, and here comes my question.

How was nature able to "understand" or "determine" what a living being needed? For example, how was nature able to "decide" that this creature needed a better eye to catch the light? Why did it even know that this being required to figure out where the light is in the first place? I don't know if my question makes sense, or if there is a better way to word it, but in simpler terms, how did the creature with light senses was even able to know that there is a light out there, a light outside, how and why did it know that it needed sight in the first place? Does my question make sense?

Firstly I'm not an American nor have I ever been to America, nor would I with its backwards healthcare system.

Secondly. You have misunderstood what evolution is and the relation to the environment.
There is the puddle explanation.
Your idea is like looking at a puddle of water and saying "The water fits perfectly the shape of the hole, the water must have been carefully positioned and designed to fit exactly as it does"

The creature that is best suited to the environment reproduces more and over time become dominant eventually becoming different species.