With the hot summer, it's easy to gaze directly at the sun when you're out, which can be very harmful to your eyes.

The most common materials used to make sunglasses include plastic, metal, and acetate. Plastic is lightweight and comes in a variety of colors. Metal provides strength and durability while acetate is more flexible.

Sunglasses are a kind of vision care product designed to prevent the strong stimulation of the sun's rays from causing harm to the human eyes. As people's material culture has improved, sunglasses can also be used as a special accessory for beauty or reflecting personal style.

Our eyes (lenses) are highly susceptible to absorbing ultraviolet light, which is invisible and can damage the eyes. To protect the eyes, it's important to wear sunglasses frequently. Ophthalmologists recommend wearing sunglasses because our eyes (lens) can absorb UV rays very easily, and UV damage has two significant features.

1. UV damage is cumulative, making it challenging for people to detect visually.

2. UV damage to the eye is irreversible, leading to permanent vision damage.

Since UV damage to the eyes is invisible and not immediately felt, if you don't wear glasses and don't feel particularly uncomfortable, it means that your eyes are not very sensitive to visible light (such as harsh glare, glare, and reflected light) and are not protected from UV damage.

Many people believe that the darker the sunglasses are, the better they are at blocking UV rays. However, the UV-blocking function of the lenses is due to the special manufacturing process that allows the lenses to absorb harmful light, such as UV rays below 400NM, when light penetrates. It has nothing to do with the shade of the lenses.

When the eye receives too much light, it naturally contracts the iris. Once the iris has contracted to its limit, people then need to squint.

If there is still too much light, such as sunlight reflected from snow, it can damage the retina. Good quality sunglasses can filter out up to 97% of the light entering the eye to avoid damage.

Some surfaces, such as water, reflect a lot of light, and the resulting bright spots can disrupt vision or hide objects. Quality sunglasses use polarization technology to eliminate this glare.

Although wearing sunglasses can protect the eyes, the quality cannot be guaranteed, and it may cause a prismatic reaction, dizziness, dizziness, similar to heatstroke, and other phenomena.

Ordinary flat sunglasses cannot have a glasses degree, and a prismatic reaction cannot occur. However, some manufacturers excessively pursue the latest styles of sunglasses, resulting in the lens curvature being too large, leading to a high lens prism degree.

This can make people wearing glasses feel that the visual object is deformed, leading to visual fatigue.

Most people need to wear sunglasses, but for some people, they may not be appropriate. For example, people with glaucoma who wear sunglasses for too long can dilate the pupil and block the surrounding iris to the anterior chamber angle.

This can affect the drainage of atrial fluid, increase eye pressure, and worsen the condition. Color-blind people wear sunglasses without much effect, but some color-blind people lack the ability to discriminate between only a few colors, so they may not be able to discriminate between colors even more after wearing sunglasses.