Sunglasses are usually used to block the sun and reduce eye damage caused by glare. Sunglasses stores usually divide sunglasses into polarized sunglasses and non-polarized sunglasses. Polarized sunglasses use polarized lenses to filter out diffuse light in the environment and only allow light in a certain direction to pass through.

Does wearing sunglasses effect the perception of traffic lights?

Traffic signal transmission ratio refers to the ability of sunglasses to red, green and yellow light through and recognition ability.If it does not meet the standard requirements, the wearer will reduce the resolution of the color, may produce color interference, resulting in color confusion, and may be unclear or even wrong to identify traffic lights.

Why do some sunglasses wear the meeting have vertigo feeling?

The deviation between the optical center and the degree of prism refers to the refraction effect produced when things are observed through the lens, and the position of things is deflected when observed.If the deviation is beyond the allowed range, blurred vision and deformation may occur after wearing, and dizziness, nausea and other symptoms may occur.
The results show that the deviation between the optical center and the prisms of the 15 sunglasses conform to the requirements of relevant standards.

Polarized sunglasses better than regular sunglasses?

The function of the polarizing lens is to filter out the diffuse light in the environment and only allow light in a specific direction to pass through. The higher the polarizing ratio is, the better the polarizing effect is. The closer the polarizing ratio of the left and right lenses is, the better.For example, when driving, if you wear polarized sunglasses, you can greatly reduce the reflection of the ground and see the road more clearly than wearing ordinary sunglasses.




Tip: What should you know about buying sunglasses?

1.Pay attention to the label or the category on the mirror leg, according to the need to buy.
At present, there are two main types of sunglasses on the market, one is sunshade lens, the other is light-colored sunglasses.The use of sunglasses varies according to the type. You are advised to check the type and category on the leg or label before purchasing sunglasses.

2.sailing and other outdoor activities to wear.

3.Sunglasses are not for everyone

For people without eye diseases, wearing sunglasses is a positive way to protect their eyes, according to Li Yan, a doctor from the Ophthalmology and Optometry Center of Peking University People's Hospital.For people with cataracts, keratitis and dry eyes, wearing sunglasses can reduce the stimulation of light on the eyes, reduce photophobia and tears.However, not everyone is suitable for wearing sunglasses. Glaucoma, color blindness and night blindness are not suitable for wearing sunglasses.

4. Check the lens regularly, and replace it in time when the lens is scratched or the film is burst.
The life cycle of glasses is related to multiple factors such as quality, frequency, environment and personal habits.Sunglasses will degrade and change with use, and the uv resistance will also decrease. When the coating on the mirror leg falls off, rusts, or the lens scratches, the film layer falls off, pay attention to timely replacement.

5. wearing unqualified sunglasses is more harmful to the eyes than not wearing them.
Due to wear sunglasses can reduce the luminous flux into the eye, causing the wearer pupil, so under the same external conditions, if the sun glasses can't stop the corresponding amount of ultraviolet light, the eye will accept more than when not wearing sunglasses ultraviolet light, that is to say, if the wear sunglasses can't stop the corresponding amount of ultraviolet ray, than when you don't wear a greater damage to the eyes.