You better not know this from your own experience, because all the states that we are talking about here you will not wish on anyone.
Let's start with a picture of a beautiful girl walking in a summer garden. This is how healthy people with good eyesight see the world around them. I hope you belong to this category.
And this is how people with squint see. Strabismus is a deviation of the visual axes from the direction of the object under consideration, in which the coordinated work of the eyes is disturbed and it is difficult to fix both eyes on the object of vision. That is, the object is slightly blurred.
This is an image of how myopic people see the world. In science, myopia is called myopia. A person sees well near, but poorly in the distance, and to solve this problem, he can use glasses or contact lenses with negative values of optical power.
As you may have guessed, this is the vision of farsighted people. They perfectly see everything that is far away and bad that is close. To read books, such people always use glasses, because the letters blur. But they can easily distinguish the numbers of minibuses at the bus stop.
Practical blindness is a type of vision in which everything is visible, but nothing is distinguished. That is, such a person sees light and even colors with outlines, but legally they are blind, because it is difficult for them to live without a guardian.
There are people who cannot see outlines and cannot focus their vision. All that is available to them is the dark gray shades of the surrounding world.
Complete blindness. These people don't see anything. Their sight is darkness. Although there is no darkness for them, because they do not know what black looks like.
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The vision of a color blind person may vary. The fact is that there are different forms of this disease. The picture shows a variant of color blindness, in which the red and green colors are dulled.
And this is how newborn children see. In practice, they distinguish between light gray shades.
This is already the vision of a child one month after birth. Outlines appear.
This is a six-month-old child that sees the world around him. It is immediately noticeable that it was as if the color was turned on.
Before us is the quality of vision of a drunk person. This state can be reached after a few drinks.
This picture shows how a person sees after smoking marijuana
Hallucinations, effects, optical illusions are all the result of LSD.
If someone has used cocaine, they see the world like this. The colors are brighter and more juicy, but somehow separated from each other.
And finally, the vision of a person who has tried heroin looks like this. The distinguishing point is not the vision itself, but the state of a person - he seems to float in the air and sees strange things.
That's all, in the end I will say that the Facts channel is resolutely against all types of drugs.