What Quality Sunglasses Should I Look For? | KOALAEYE OPTICAL

What Quality Sunglasses Should I Look For?

How to Tighten Glasses by Yourself

After your glasses being used for a while, they will become loosen. In this situation, you may want to ask for a professional optical person to adjust or tighten it. It would be a way but with some inconvenience. So, you can also choose to tighten glasses by yourself.

Why the glasses will become loose? It can be caused by various reasons. Most people wear and remove their glasses several times every day. The back and forth movements of the glasses’ arms will increase the possibility that they will become loose.

If the glasses become loose, you can choose to tighten them by adjusting the temple arms. Most eyeglasses have a screw located at the temple hinge on both sides. To tighten glasses by yourself, you can choose to tighten this screw to make your glasses more comfortable or prevent them from slipping down your nose again. You had better check these screws periodically so you can tighten them before they fall out.


Why do nose pads turn green?

Because there are copper accessories in glasses. And the copper and sweat mix for a long time, so it will corrode and rust. The greenness is the mixture of copper salt (copper rust) produced by the copper element in the coating and inorganic salt in sweat and grease dust. The color of copper is green, so is the dirt. If you sweat a lot and the lens bracket is metal, the nasal bracket silica gel is easy to turn green. This is usually due to oxidation caused by the combination of nickel with the natural oils in the skin. Your nose is usually the oily part of your body. The oil in the nose mixes with sweat and then oxidizes the metal. Glass frames are usually made of a kind of copper called Monel. Monel is an easily corroded metal that does not react to many chemicals. It's skin-friendly. The only downside is that it turns green when it rusts.



What is an eyewear chain store?

Eyewear chain is a retail company that operates the same kind of eyewear products or services by its branches under the leadership of the core head store or head office. It is an economic union organization form that achieves scale benefits through standardized operation and management. Among them, the core company is called the headquarters, and the main store or the scattered operation company is called the branch store, the store, or the member store. It is one of the most popular modes in the eyewear retail industry to adopt the mode of chain and scale operation.


Limitations of NXT lenses

NXT lenses made from Trivex can't be cut by means of traditional edge cutting ways, requiring certain edge grinders, which has caused some problems for retail stores. Therefore, now NXT lenses are more used in some glasses, like sunglasses, protective goggles, and so on.



How to know if lens is polarized?

Make use of LCD screens. Point the glasses horizontally at the LCD screen and then rotate them upward by 45 degrees clockwise. If it is a polarized lens, it will show a change in color deepening. If it does not change no matter how you rotate it, it is not a polarized lens. You can borrow another person's polarized lens or have previously worn a known true polarizer, and place it crossover with the new glasses you want to buy. At this time, you should see the object clearly from the crossover part with your eyes. Then cross the glasses vertically and horizontally, and at this point, the opposite object should not be visible from the intersection. If this condition is satisfied, it means that a true polarized lens is being tested.


What Is Polycarbonate Lens?

Polycarbonate was developed in the 1970s for aerospace applications and is currently used for the helmet visors of astronauts and for space shuttle windscreens. Polycarbonate lenses were introduced in the early 1980s in response to a demand for lightweight, impact-resistance lenses. Since then, polycarbonate has become standard for safety glasses, sports goggles, and children’s eyewear.

Polycarbonate glasses are thinner and lighter than regular plastic lenses. They provide 100% UV protection and are up to 10 times more impact-resistance than plastic or glasses lenses. Polycarbonate glasses also offer clearer and more comfortable vision if an anti-reflective coating is applied to the lenses, which can eliminate distracting lens reflections that interfere with vision, particularly when driving at night or in other low-light conditions when glare sources are present.

However, polycarbonate lens is a naturally soft material, making it more subject to scratching without adequate protection with a scratching-resistant coating. Polycarbonate glasses have high dispersion due to its low Abbe value of 30, causing chromatic aberrations.


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How polarized glasses can help you drive

The most important thing about polarized sunglasses is that they can be a good helper when you drive. When sunlight hits your eyes at an awkward angle, these sunglasses will save your life and save you from potential accidents. Polarized glasses can filter out the sunlight reflected from objects such as roads, snow, water, and other objects. It helps to neutralize the effects of reflected sunlight. Polarized sunglasses bring you an incredibly safe driving experience, with almost no interference and no harm to your eyes.

At night, glare and embarrassing lights are everywhere on the road, especially because random drivers come from the opposite side. Some of these driving high beams may disrupt your vision and cause potential accidents. Polarized sunglasses help reduce glare and save your life. Polarized lenses hardly reflect.

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