In the eyes of many myopia people, choosing glasses is a very difficult thing, because it is not understandable to choose the lens, so it is more troublesome to choose.So, how should we choose for lenses? ...
What should I pay attention to when choosing a lens
In the eyes of many myopia people, choosing glasses is a very difficult thing, because it is not understandable to choose the lens, so it is more troublesome to choose.So, how should we choose for lenses? Let me tell you what the lens chooses needs to pay attention to!
1. The lens should be seen four:
See if the glasses companies have obtained the production license of glasses products;
Second, see if the optometry equipment and detection instruments of glasses companies have a qualified mark;
Three to see the optometry and whether the producer holds a certificate to work;
Four to see if the glasses are qualified marks (certificates).
2. Material of the lens:
The refractive index of glass lenses is stable, abrasion resistance, and stable optical performance, but it is heavier and easy to break.
Glass lens: stable refractive index, good abrasion resistance, stable optical performance, but heavier and easy to break.
Resin lens (CR-39): light, safe, high light transmission, not easy to break, but the surface is easy to wear.
PC lens: high refractive index, firm, but easy to wear.
3. Green film or blue film:
Generally speaking, green membranes are more advanced and complex than blue -membrane and purple membranes. The increased band is wider and more peaceful, and the increased valley point is green in the center of the visible spectrum.In addition, the color of the membrane layer has nothing to do with anti -radiation performance and no difference.In general, the green film eliminates a better reflective performance, and the blue film is good for radiation. It mainly depends on your needs to choose the lens. Of course, you should not consider the color alone.
4. Accurate optometry:
It is best to choose a hospital or a larger glasses shop for optometry.
For the first time with glasses, if you are under 35 years old, you should have a pupil test.
Elderly people should also wear glasses. Do not greedy to buy mirrors from the stalls cheap, so as not to cause damage to the eyes.
After the optometry, consumers should wear 15 to 30 minutes, myopia mirrors and long -sighted mirrors should wear mirrors to walk and go up and down the stairs; old flower mirror wearers should read books and read newspapers.
If you have discomfort, please adjust the lens in time until you are satisfied.
4. Different people:
High myopia should buy high refractive index n = 1.70, 1.80, and even 1.90 lenses (this refers to glass lenses. The highest refractive index of resin optical lenses is 1.74) to reduce the thickness of the lens without buying color -degenerative lenses; children should children should be children.选购光学树脂镜片，以保证配戴的安全性;一般近视患者宜配略红色的光学红片或略带蓝紫色的光学可司片，以保证阻断大部分紫外线对人眼的侵害;水上The operator uses polarized scene.In order to increase the light transmission rate of light, increase the definition of the visual object, you can choose a diaphragm lens.
5. Leeper function
Anti -light protective lens: This lens is coated with a thin layer of magnesium fluoride on the surface to prevent strong light reflexes and make you see things clearer and not disturbed by strong light.To detect whether your glasses really use anti -light protective lenses, you can align the glasses at the light source. If you see the purple green reflection, it means that the lens does have a protective film with anti -reflection.
Color lens: Also known as "dyeing lens", it is during the lens production process, adding some chemicals to make the lens appear color to absorb the light of a specific wavelength.This is the most commonly used lens type used in sunglasses.
Color -painted lens: The effect of this lens is the same as the color lens. It is only made of different ways. It is to apply the color to the surface of the lens. The most well -known is the "gradient -like coloring lens". The color is the deepest above, Then go down.Generally, sunglasses with a degree of degree are mostly treated with color -coating.
Polarized lens: In order to filter the dazzling light of the solar shirt on the water surface, land, or snow, add vertical special coatings to the lens, which is called polarizing lenses.It is most suitable for outdoor sports (such as: maritime activities, skiing or fishing).
Trimming lens: Some people are also called "photosensitive lenses".Because the chemicals of silver are added to the lens, so that the original transparent and colorless lenses will become colored lenses when encountering strong light, so it is suitable for indoor and outdoor simultaneous use.

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