Should I wear glasses all the time for myopia?
Wearing glasses is more to correct your vision and protect your eyes, so as not to worsen myopia. If you are nearsighted but don't wear glasses, it will have a lot of impact on your eyes. First of all, after a person is nearsighted, seeing distant things requires a lot of adjustments to the eyeballs, which will make your eyes tired easily. Over time, your myopia will increase quickly. When we are nearsighted, sometimes the myopia of the two eyes is not the same. If we do not wear glasses and correct vision, this will affect the normal development of vision. The difference between the powers of the two eyes may become larger and larger, which is easy to cause a squint. After myopia, if you want to see far away things clearly, you need to squint your eyes harder to see clearly. Therefore, some nearsighted eyes often squint when they are not wearing glasses. However, the action of squinting will cause the upper eyelid to form a pressure on the eyeball, and squinting for a long time can easily cause amblyopia. Squinting your eyes for a long time will also make your eyes smaller and affect your appearance. Therefore, once your myopia exceeds 200 degrees, you must wear glasses in time.
What are polarized lenses for?
Polarized lenses contain a layer of polarizing plates in which molecular chains form a light-grating structure in which dichromatic pigments, which absorb polarized light, are evenly distributed. A beam of light is absorbed when it vibrates in the same direction as the bars of the molecular chain of the polarized lens. The grating direction formed by the molecular chain of the polarizer is the axial direction of the polarizer, which is generally horizontal. When polarized lenses are worn, they absorb all the light that vibrates horizontally, thus absorbing the glare and preventing it from reaching the eyes.
The lens material
Lens material affects the effect of protecting our eyes, so we should choose the kind of driving glasses made of polarized lens, which can effectively reduce the dazzling lights, and can filter out the redundant lights. When used at night, the powerful light is softened and the vision is clearer, thus ensuring the safety of drivers and relieving eye fatigue. If you can, let the seller dim the light when you buy, feel the softness and clarity of the light after wearing the product.
How to Test Computer Glasses (Clear Glasses)
First, we will show you how to test computer glasses with clear glasses.
1. Ask for Blue Light Glasses Brand Spectrum Report
To find out whether your blue light glasses are the best computer glasses, you should contact the company you bought them from and ask for a spectrum report. It will show you how much blue light your computer glasses can block.
After sending the spectrum report to you, you should make sure that your computer glasses are able to filter at least 30% blue light, otherwise, they are unsafe.
2. Use the Lens Reflection Test
As for how to test computer glasses, you can use the lens reflection test. You can see what color the light is that reflecting off the lenses.
If it reflects the blue light, they are filtering some blue light. If the reflection is violent or purple, the computer glasses may be not effective.
This is a good way for you to perform a blue light test at home.
Why should children wear blue-light-blocking glasses?
Due to the short wavelength of blue light, the focus will fall in the front of the retina. In order to see clearly, the eyeball will be in a state of tension for a long time, causing visual fatigue. Studies have found that exposure to blue light at certain doses can damage epithelial cells on the surface of the eye, causing or aggravating dry eye. Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, leading to the atrophy and death of retinal pigment epithelial cells. The death of light-sensitive cells will lead to vision loss.
Optical Stores Provide Free After-sales Services
They help check eyesight regularly and check eyesight every six months. They help replace accessories, including all kinds of screws, nose pads, temple tips, protective film, etc. The glasses frame can be repaired and made adjustment, with lens ultrasonic cleaning. They help popularization of science, such as consultation on optical problems in ophthalmology, distribution of eye care manuals, and eye charts. Glasses can be repaired (replaced) free of charge after accidental damage. For consumers, it is undoubtedly a good thing, especially for student consumer groups. Because the students are active, frequently use glasses, and easily have other wear and tear problems.
Why are eyeglass frames are so expensive?
Plastic frames are often used for rimless glasses, but they are not very resistant to corrosion and break easily. The plate is a new type of plastic, and it is light and has high hardness, not easy to deform, but the surface is easily corroded by sweat. TR90 has features of wear resistance, good chemical resistance, solvent resistance, weather resistance, not burning, high-temperature resistance. Plastic steel does not contain any metal, but it is a kind of high-strength molecular material, lighter than TR90. They have a higher level in corrosion resistance and strength and other aspects. The frames made of good materials are more comfortable, durable, and textured in daily wear, and will not cause skin allergies. Plate, titanium, TR90, alloy are the most used materials on the market at present. The price is in dozens of yuan to hundreds, thousands of yuan.
