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.
What is the cheapest way to buy prescription glasses?
The choice of frames is not only good-looking but also has a lot to do with whether the polished glasses can be worn correctly. Therefore, special attention should be paid to the selection of spectacle frames, and the pupil distance and the optical center of the spectacle lens should be placed in a suitable position. It should also match the shape of the face so that the paired glasses are not only beautiful but also comfortable to wear. If you don’t choose a frame according to this, but choose anyone according to the general rules, the pupils will not match the optical center of the glasses, and the deflection center of the glasses will appear, causing the prism effect, which is very harmful to the eyes. How do choose a frame? Glasses are worn on the face after all, and they have a decorative effect, so you still have to see if they fit your face shape. In addition, the weight should be light and the frame size should be appropriate. It is best to measure the interpupillary distance, otherwise, it is easy to cause squint and cross-sight. It is safer for children to choose a plate frame with resin lenses. There is a wide range of options for adults. Glass lenses have higher hardness and are not easy to wear, while resin lenses have lower hardness but lightweight, good clarity, and higher protection against ultraviolet rays. Although crystals are expensive, they have high ultraviolet and infrared transmittance.
The lenses of prescription glasses
Common materials for lenses include glass, resin, and PC. The glass is fragile and heavy, and few people wear it anymore. PC film is tough and not fragile, but it is not resistant to high temperature and the surface is easily scratched. The most common type of lens on the market today is the resin lens, which is light in weight, hard to break, and reasonable in price. At present, it is generally recommended that you choose resin sheets, and it is recommended that people with ultra-high myopia choose glass sheets.
Generally, lenses can be divided into spherical and aspherical surfaces according to different curvature designs. When choosing, refer to the degree of the eye. For people with lower degrees, There are fewer differences between the two shapes. For people with moderate to high myopia, aspherical lenses will have better imaging effects and clearer vision.
When choosing a lens, a parameter that is often mentioned is the refractive index. Common refractive indexes are 1.56, 1.60, 1.67, and 1.74. With the same degree, the higher the refractive index, the thinner the lens.
Wide-rimmed Clear sunglasses
Wide-rimmed Clear glasses cover almost the most area of your cheeks, even covering almost half of your cheeks.
Conservatoire Light gray clear frame sunglasses
Conservatoire International De Lunettes, founded in 2013 in Italy, specializes in fashion and retro glasses and sunglasses. Starting from the classic glasses of the past, new research results, photography, film, and retro elements are integrated into the design of glasses. These shapes may have been used by a classic character, or they may have been historical design elements, modernizing them to create a sense of fashion.
Polycarbonate vs Plastic Lenses: Which One Is Better?
From the above information, you may have learned some features of polycarbonate glasses and plastic lenses. So, do you know which one is better?
Here are some a few differences between both lenses to determine which one is better.
- Polycarbonate lenses are more expensive than plastic glasses.
- Polycarbonate lenses are very resistant to tint compared with plastic lenses which accept tints.
- Polycarbonate glasses have inherent UV protection, while plastic lenses do not have.
- Polycarbonate glasses have higher impact resistance and offer greater protection than plastic lenses.
- Polycarbonate glasses are lighter than plastic glasses.
- Plastic glasses have a higher optical clarity than polycarbonate lenses.
So, from the above part, you may have learned which one is better and you may have a decision of how to choose.
The two main laboratories provide different services. The Eyewear Repair Lab is made up of two technicians to provide solutions to the most difficult repair work for network eyeglasses repair customers. The prescription lab is staffed by optometrists and tasked with delivering about 30 prescription orders a day to retail customers and Internet customers. The lab is in charge of cutting lenses, forming rimless and semi-rimless frames bit mounting, edging, and finishing, and has anti-reflective and anti-UV coatings.They provide very competitive prices because all repairs are carried out in our own optical laboratory.
How long do plastic frames last?
Plastic frames are made of non-biodegradable materials and are possible to last forever. If the frame is made of acetate, the layers of acetate fibers make the frame vary in degrees of transparency and pattern. The plastic frame manufacturing process makes the plastic frame more brittle than the acetate frame. In this sense, the acetate frame has a longer service life. Then the plastic, which is made of SAP, will never break down. Depending on the circumstances, it could take years. If the lenses are polycarbonate, the material takes hundreds of years to break down naturally. If TR-90 is normally stored, not exposed to the sun, and put in the box with cloth wrapped, and then you can keep 3 years, there is no effect.