However, sometimes our eyes don't bend light properly. This can happen if the shape of the eye is a bit off, like if it's too long or too short, or if the clear front part of the eye, called the cornea, isn't perfectly curved. When this happens, images can look blurry or distorted. This is where eyeglasses and contact lenses come in.

Eyeglasses and contact lenses work by adjusting how light bends when it enters your eye. They act like mini magnifying glasses or little mirrors specially designed to correct the way light travels into your eyes. Depending on the problem with your vision, these lenses can be shaped differently. For instance, if you're nearsighted (meaning you see close things clearly, but far things are blurry), your lenses will help spread the light out more. If you're farsighted (meaning close things are blurry, but far things are clear), your lenses will help focus the light more tightly.

Both eyeglasses and contacts are made based on a special measurement of your eyes, ensuring they correct your vision just right. By tweaking how light bends when it enters your eyes, these lenses help ensure that light hits the retina in just the right way, making things look sharp and clear again!

Imagine sticking a pencil into a glass of water. You'll notice that the pencil looks like it's bending at the point where it enters the water.

That's because air and water bend light differently. When light moves from the air (where it travels quickly) into the water (where it travels slower), it changes direction slightly, making the pencil appear bent.

This bending trick is all due to refraction, which happens anytime light enters a new material at an angle, like going from air into water.