Notes on Wearing Sunglasses in Summer

Because the heat of the scorching sun may have made eyes hard to open in summer, many people have worn sunglasses to prevent strong sunlight from harming the eyes. But it is worth being noted that the improper selection and wearing sunglasses may injury eyes, and not everyone is suited to wear sunglasses.

Beware of that sunglasses hurt eyes.

If there is no anti-UV function in sunglasses, wearing glasses is more harmful than not.

In the hot summer, people are wearing sunglasses in different colors. However, ophthalmologists have warned the public not only to be cool.

Ophthalmologist said, wearing sunglasses without UV function will injure eyes more than not wearing glasses, but there is simply not enough public awareness of sunglasses.

Colored glasses do not mean sunglasses.

Are glasses with red, yellow, purple, green lenses called as sunglasses? In the past, the main color of sunglasses are dark blue and brown, the market appeared colorful colored glasses resent years. Some people think that colored glasses are sunglasses and they consider it is especially cool to wear them. In fact, this is a misunderstanding.

The experiments show that because of different colored glasses, eye itself does have a protective effect. But because it can’t block UV, it has lost the function of sunglasses.

If you wear a pair of sunglasses without anti-ultraviolet function, it is more dangerous than not wearing, because the human body has the instinct of self-protection response. When the eyes confront with bright light, the pupils will naturally become smaller, which reduces the UV energy into the eye. Once you wear sunglasses without anti-ultraviolet function, pupils will dilate. In addition, such glasses are not playing the role of anti ultraviolet radiation, at this time, eyes open wide like a door which lets energy go into. You can imagine that how much the eyes would be harmed.

Poor sunglasses harm eyes greatly.

The reason why sunglasses are able to block UV is because the lenses add a special layer of coating. After coating the lens, in addition to block and absorb ultraviolet rays, sunglasses can block a part of useful light. So the transmittance of the lens decreases. The ability of blocking ultraviolet light of the good-quality of the sunglasses is good and little decline in light transmission which does not affect the general definition.

Poor-quality sunglasses are completely different. Not only is the ability of UV-blocking not strong and easy to damage the coating, but a serious decline in the lens transmittance. When the pupils become large, a large number of remnants of ultraviolet light go into the eye, so that harm eyes. Furthermore, the irregular lens surface cause deformation of objects when see the outside world, which lead to eyeball acid gradually, loss of appetite, forgetfulness, insomnia and other symptoms of visual fatigue.

In view of this, when people buy sunglasses, they can be judged from whether it is clear or not. To the general public, the only way of buying high-qualitysunglasses is going to the professional optical shops.