Eye diseases caused by UV rays can be divided into 2 groups

• A short-term disease that occurs when the eyes are exposed to high concentrations of UV rays for a long time, causing inflammation of the cornea ( photokeratitis ) , symptoms include eye irritation, tearing, photophobia , red eyes , eye pain, and a feeling like there is a foreign object in the eye.
• Long-term diseases: UV rays affect both the skin around the eyes and the eyes, such as sunburn, skin cancer, melanoma, pinguecula, pterygium, cataracts.

One thing that can help protect your eyes and the skin around them is sunglasses , because they help reduce your exposure to UV rays, similar to sunscreen that protects your face and body.

What should you look for when choosing a good pair of sunglasses?

There are 6 principles for choosing good sunglasses

1. UV protection.

To know whether the sunglasses you ทางเข้า UFABET สำหรับสมาชิกใหม่ สมัครวันนี้ รับโบนัสฟรี are going to buy can protect against UV rays, there is an easy way to observe by looking at the inside of the glasses legs, which will have the letters CE. Which is a European standard certification mark, on them.

Notes

• The letters C and E must be 5 mm high.
• There is a specific distance between them.
• The letters have a circular curve, and the inner curvature of the letter C must be equal to the outer curvature of the letter E.

The UV400 or UV40 symbol is an indicator of the sunglasses’ filtering rate that can protect the eyes. UV400 is the mark that indicates the best UV filtering efficiency. Which is 100 % protection against both UVA and UVB rays.

2. Can cut reflections.

Good sunglasses must be able to cut reflections or be polarized glasses. This is because the lenses are made of various materials such as glass or plastic. When worn, reflections are visible. Anti-reflective glasses will help make the image clearer. Increase visibility, and be more comfortable to wear.

3. Choose the right lenses for your activity.

There are 3 types of lenses commonly use for sunglasses:

• CR39 lenses are the most widely used plastic lenses because they are highly scratch-resistant and provide protection against both UV and infrared rays.
• Lenses made of glass are clearer and more scratch-resistant than plastic lenses, but they are heavy and can break in the event of a serious accident.
• Polycarbonate plastic lenses are the lightest, most impact resistant, and are often used in sports or extreme activities. They provide the best protection against eye damage.

4. Color of sunglasses lenses: What properties does each color have?

• Black is most suitable for outdoor activities.
• Gray helps filter light and cut glare without distorting the color. Suitable for wearing to the beach.
• Orange or yellow helps to see more depth of field, but will have color distortion, making it unsuitable for wearing while driving.
• Brown makes colors and natural light more visible, increasing your vision, especially when driving a car or motorcycle.
• Green helps filter light and cuts light as well as grey, making it comfortable for the eyes and suitable for outdoor activities.
• Tea color and dark gray color are suitable for general use.

5. Choose eyeglass frames that match your face.

Each person’s face shape is different. Here are some tips for choosing the right glasses frames:

• Square faces should wear round-framed glasses.
• Round faces should wear large-framed glasses to cover the cheekbones, which will make the face look younger. Emphasize square-shaped glasses.
• Long faces should wear oval-rimmed glasses that completely cover the area around the eyes.
• Oval face can wear any type of glasses frame. To look best, wear square-shaped, light-colored frames.

As for the size of the frame, you should choose a large frame with wide temples on the sides to help protect the skin around your eyes more. Good sunglasses should block light from all sides.