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Now, from the inside, we see something like this.

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This is like a ball, okay?

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Like a small ball that we have inside.

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If I put it like this, you see this part, that would be the external part,

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and this part, that would be the internal part.

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It's like a ball that we have here, okay?

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In this ball, in this eyeball, we have different parts.

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The first one, the cornea, very simple, is just a layer, transparent layer of cells that protects your eye.

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Okay? It's something very simple.

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A layer of cells for protection.

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The next part is the pupil.

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The pupil is the black circle that you see in the eye.

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But if you see here, you don't see anything.

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There is a hole.

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There is nothing here. It's a hole.

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Yes, because the pupil is a hole.

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It's like a door to the inside of your eye.

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Okay? And we have this hole, this door, so the light can enter inside.

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If the pupil is bigger, more light can enter.

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And if the pupil is smaller, a little bit of light can enter.

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So when we are in the dark of the night, the pupil gets bigger, so more light can enter.

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And like this, you can see better. Okay?

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but how can we control the pupil? How can we make the pupil bigger or smaller? Very simple,

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with the iris, okay? The iris is the color part of your eyes. It's a ring of color and in the

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middle of the ring we have the pupil, the hole or the door to the inside. The iris is the part

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that opens and closes okay it gets bigger and smaller to make the pupil

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bigger and smaller maybe you can see better like this if you see here this is

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the pupil okay this hole this space that we have here and this and this is the

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iris okay and I want you to look at the iris and these parts because when it's

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cloudy so when there is not a lot of light the iris contracts so the whole of

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the pupil gets bigger and more light coming you see how much light enters

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here. But when there is a lot of light, the iris expands like this. The hole gets

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smaller and only a little bit of light can enter. And if you see here is going to

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appear an iris. Do you see? Sorry, an eye. Do you see here the pupil is smaller and

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and here the pupil is bigger. More light connector, a little bit of light enters. Do you see?