The basics:
View attachment 48569
"First, light passes through the cornea (the clear front layer of the eye). The cornea is shaped like a dome and bends light to help the eye focus.
Some of this light enters the eye through an opening called the pupil (PYOO-pul). The iris (the colored part of the eye) controls how much light the pupil lets in.
Next, light passes through the lens (a clear inner part of the eye). The lens works together with the cornea to focus light correctly on the retina.
When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals.
These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see."
All the different part of your eyes work together to help you see. Learn the jobs of the cornea, pupil, lens, retina, and optic nerve and how they work together.
www.nei.nih.gov
Pointing out how the eye works in this thread is as futile as calling a plumber because your basement is full of water, when your entire region just got hit by a tsunami.
The problem is not any particular crazy thing that peacegirl believes, but the very basis of her understanding of what knowledge
is.
She is, sadly, one of the vast majority, for whom observation, science, logic, and reason play little or no part in decisions about what reality is like.
This medieval mindset, in which words are magic, writing is sacred, and individuals can alter reality by their words and/or thoughts (or can do so by proxy - appealing to supernatural individuals, with that power of changing reality, to intercede on their behalf) is the norm, even today.
Humans cannot change reality by words or thoughts alone.
Humans cannot change reality by asking "powers", "elementals", "imps", "demons", or "spirits" to intervene as proxies.
Humans cannot even lobby for changes to reality by petitioning gods through prayer or
ass kissing worship, in the hope that the gods will intervene.
Reality is real, and nothing else is. Interaction to change reality is limited to what we can physically do, or can build physical machines to do.
Human societies are hugely complex. Their problems have no simple solutions, and trying to solve all the problems of humanity (or of a part of humanity) by persuading people to
all believe the same nonsense, is futile.
Even trying to get them all, or a majority, or even a large minority, to believe things that are
demonstrably true, is futile.
But simpletons gonna oversimplify.
It would be wonderful if everyone would just agree on some simple facts, and some easy rules for getting along, and if we would, as a consequence, all just live in peace, harmony, and cooperation.
It would also be wonderful if the faeries granted us wishes.
But it's not ever going to happen, so we need to grow the fuck up, put on our big boy pants, and just try to make our own little bit of reality a tiny bit less irrational, less unfair, and less miserable. And we need to understand that lots of people will have very odd ideas about how to do that, and lots of people will refuse, or will never even think of trying to do that at all. And we need to understand that our gains will be small, and our setbacks many; And that we will likely only ever make a tiny difference.
It will be a victory (albeit a small victory), if we only manage to avoid any further backsliding into pre-Enlightenment claptrap.
In the face of this huge and intractably complex problem set, there will always be simpletons who demand that we conform to their simplistic "answer". One of the many things we can do to advance humanity an iota (or maybe two) is to tell such simpletons to stick their secret and arcane knowledge right back up their arses, and get on with doing something actually good for their fellow humans.
This can be difficult to stomach, because many of these simpletons are actually quite nice people, when they are not busy trying to drive us back into misery and horror of the Dark Ages.
