100 people go to the sun and 101 people get dizzy, that's because ...

Why is it so dizzy to go on a sunny day, is it because my eyes are weak?

Going through a drizzling day, I love the sunny days. However, say try it, is it when you go to the sun when you suddenly see your eyes flower? Not only that, many of you feel dazzling, tearing every time you go in the sun (even though it is not hot).

What is this phenomenon? Is our eyes weak, myopia is it like that?

Bright sunshine and dizziness when entering the shade

In the light from the Sun emits many types of rays including UV rays (also known as ultraviolet rays, ultraviolet rays .).

This group of rays beamed on Earth was blocked by 98.7% of the atmosphere, only 2.3% passed. However, depending on the intensity or severity, they will affect the body, especially the skin and eyes.

In a sunny environment, strong light, pupils of the eyes often shrink to avoid strong light sources.

When going to the street, especially when it is sunny, this light is quite strong, your eyes will tend to pull back. This is a normal phenomenon, because when the glare is detected, the eyelid is directed by the brain to help the eyes to close quickly, to hold back to prevent UV rays from entering the eyes.

Parts such as the iris will regulate a large opening or opening to adjust the amount of light into the eye to avoid eye damage.

Specifically, in sunny environments, strong light, pupils of the eyes often shrink to avoid strong light sources. In contrast, in a cool, shady environment, pupil pupils will often expand to catch more light.

Strong light rays can penetrate the eye, causing damage to the retina.

So when you go back to the sun, come back to the house, you suddenly feel a little dizzy, this is when the pupils change their state, expand when in the shade.

And there are days when the eyes are damaged by sun damage .

Be aware that strong rays can penetrate the eye, causing damage to the retina. The retina is a nerve-sensitive layer of light, if this nerve layer is burned, especially in the central region (macula), the eye will be blurred, difficult to recover.

Strong UV exposure without protection, eyes can get cancer.

More dangerous, strong UV exposure can cause conjunctival degeneration, cataract, even cancer .

Therefore, to avoid dizziness when sunning or harming your eyes due to exposure to UV rays (especially from 10 - 16h), you should wear sunglasses to protect your eyes.