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How to choose sunglasses for eye health

Right now, sunglasses are seasonal. Sunglasses are an essential item for fashion people to get their style regardless of the season, but it is essential for everyone in the summer. Sunglasses not only protect the eyes from glare but also prevent cataracts, macular degeneration, glaucoma and other eye diseases caused by ultraviolet rays. So, I learned how to choose sunglasses that can protect your eyes and health with style.

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1. Sunglasses Concentration

It is the principle of sunglasses that darkens vision with a black lens to prevent glare. But let's avoid sunglasses that are too dense. If the concentration of sunglasses is too high, it is not only inconvenient to work on, but also makes the vision dull and increases the risk of safety accidents. In addition, when the pupil is enlarged due to the darkness of vision, the fatigue and burden of the eyes increase and the infiltration rate of ultraviolet rays increases. Rather, it can harm eye health. Ophthalmologists and experts generally say that a coloring density of 60 to 80% is acceptable.

2. UV Protection

In addition to preventing glare, sunglasses are also important for ultraviolet (UV) shielding. Ultraviolet rays are harmful factors that trigger various eye diseases such as cataract, macular degeneration, and glaucoma. The ultraviolet rays that cause eye diseases are ultraviolet rays A of 320 to 400 nanometers in wavelength. Among ultraviolet rays, as the wavelength approaches 400 nanometers long, the wavelength is long and permeability is strong, so ultraviolet rays can penetrate easily into the eye. Therefore, it is advisable to wear sunglasses that completely block the harmful ray ultraviolet rays at a maximum wavelength of 400 nanometers to close to 100%. 

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3. Sunglasses Lens Color

The color of the sunglass lens should be chosen according to the application. Brown clarifies the field of view and filters blue light well, making it suitable for long distance driving. Yellow is helpful for night driving. Gray reduces the burden of color and is good for outdoor activities such as hiking. Old people are also gray. The green system is close to natural color, so it has a good sense of foreign body and fatigue, so it is good for a long time or white sand.

4. Frequency glasses sunglasses

If you usually wear sunglasses, you may want to buy a sunglass lens for sight correction at the optician after receiving a vision test. This type of sunglasses will break the surface coating in the course of the expansion of the lens material and coating material, which has different expansion coefficients depending on the temperature when exposed to a long period of time in the vehicle or in direct sunlight. Care must be taken as this split lens becomes unusable.