Views: Author: Site Editor Publish Time: 2022-12-01 Origin: Site
Sunglasses, also known as sunshades, are used for shade. People in the sun usually have to adjust the size of their pupils to regulate the luminous flux, which can cause damage to the human eye when the intensity of the light exceeds the adjustment capacity of the human eye. Therefore, Tr90 sunglasses are needed to protect the eyes from the sun when outdoors, especially during the summer months, to reduce the damage caused by eye strain or glare irritation due to eye adjustment.
Below is a list of contents.
The principle of Tr90 sunglasses
Selection of Tr90 sunglasses
Sunglasses block out uncomfortable glare while protecting the eyes from UV rays. All this is possible thanks to the metal powder filter which "selects" the light as it comes in. Thanks to the use of very fine metal powders, tinted glasses selectively absorb some of the wavelengths that make up the sun's rays. When light hits the lenses of Tr90 sunglasses, the light is attenuated by a process known as phase extinction interference. This means that as certain wavelengths of light pass through the lens, they cancel each other out on the inside of the lens, in the direction of the eye. The formation of overlapping light waves is not an accidental phenomenon, as the crest of a wave combines with the trough of a wave close to it, resulting in mutual cancellation. The phenomenon of phase-canceling interference depends not only on the refractive index of the lens but also on the thickness of the lens. In addition, Tr90 sunglasses should not be exposed to direct sunlight.
Tr90 sunglasses block out UV rays because of the special coating added to the lenses.
The color of sunglasses is preferably light grey, teal, or light smoke, followed by green, amber, blue, etc. Red is only used for sunbathing or on snow.
Polarised sunglasses are preferable when traveling in a car as they reduce the harshness of the light.
If people can see your eyes very clearly when you wear sunglasses, then your lenses are too light in color.
It is best to take off your sunglasses when the sun goes down, otherwise our vision will be affected in any place where there is not enough light.
You should go to a regular optician to choose sunglasses with UV protection from regular manufacturers.
Pay attention to the surface condition of the lenses when choosing.
When buying Tr90 sunglasses, you can judge them by the clarity of your vision. To get quality sunglasses, you should only buy sunglasses from optical specialty shops and regular optical shops.
Guangzhou W&M Optical Co Ltd is a manufacturer and exporter of eyewear products in Guangzhou, China. We hope to meet our customers face to face through Tr90 sunglasses and welcome customers from all over the world to contact us at any time to establish future business relationships and achieve success together.
