Different Type of Lenses: How to Choose
In this section, we will list some of the lenses for glasses.
Plastic lenses: In 1947, the Armorlite Lens Company in California introduced the first lightweight plastic lenses. The lenses were made of a plastic polymer called CR-39, because it was the 39th formulation of a thermal-cured plastic developed by PPG Industries in the early 1940s. Plastic lenses are light and low cost.
Polycarbonate lenses: polycarbonate lenses were first introduced in the 1970s and they have become increasingly popular anad remained for a long time. Polycarbonate glasses are slighter and significantly more impact-resistant than CR-39 plastic, making them a preferred material for children’s eyewear, safety glasses, and sports eyewear.
Driver's protective glasses
The principle of the driver's protective glasses is to use the special film on the glasses to reflect the strong light hitting the glasses back to protect the eyes. It can protect against ultraviolet, infrared and blue light on foggy and rainy days. In snowy weather and at night, the wearer can see the scenery more clearly, and it can also increase the vividness of red, yellow, green, white, and other colors, and eliminate the glare and reflected light of the oncoming cars when meeting cars at night.
How to Choose Glasses for Big Heads?
In this section, we will show you how to choose an eyeglasses frame for large heads. If you do not know how to choose, keep on your reading to find some solutions.
Rectangular frames: Rectangular frames add angle and can slim down the appearance of a larger head. So, if you have a big head, try the rectangular frames glasses.
Oversized frames: if you have a big head, the oversized frames would be a good choice. Oversized glasses will balance out your larger features.
Wayfarer frames: whether your style is retro or geek chic, you will find a perfect fit in trapezoidal wayfarer. The thick angular frames offset rounder cheeks and draw attention down from the forehead. So, if you have a large head, try this style.
When choosing glasses for large heads, you should also find the right shape and color for your signature look and style. While there are a lot of glasses styles for big heads, you should consider glasses with long enough temple length, the length between the hinge of your frames and where they bend around the ear. This measurement is critical for overall comfort, especially on your temples and near your ears.
So, from the above information, you have learned how to choose glasses for big heads.
Polycarbonate vs High Index: What Are the Differences?
Here, we will briefly show some differences between polycarbonate lenses and high index lenses. If you are looking for thinner and lighter lenses, high index lenses would be a good choice. High index lenses are strongly recommended for those people who require a strong eyeglasses prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. Besides, you need to know that the stronger prescription, the thicker the edges of the lenses. So, high index lenses are good choices because they are slimmer and lightweight.
Polycarbonate lenses are an ideal option for children’s eyewear since they are tough, lightweight, tough, and durable. Because of their durability, polycarbonate lenses are much less likely to break or fracture than even high index lenses.
So, from the above information, you can know the differences between polycarbonate and high index lenses. With these differences, you have known how to choose the lenses when prescribing a new pair of eyeglasses.
If you want to get a pair of new eyeglasses, you can choose to go to the local optical store. However, nowadays, you can choose to prescribe glasses online. This gives you great convenience. If you want to get a pair of new glasses online, Koalaeye Optical may be a good choice for you, which is a professional optical online store, providing all kinds of glasses or sunglasses, such as blue light blocking glasses, progressive lenses, driving glasses, and so on. In addition, Koalaeye Optical provides a free shipping service.
The oval shape is suitable for all kinds of frames.
Women with oval face shapes are very in line with Oriental aesthetic standards of beauty face shape.All kinds of frames are suitable, just pay attention to the size of the frames should be proportional to the size of the face. Especially female ellipse face, appropriate chooses the frame of any design but had better not use a straight-line frame, namely too tall too flat frame. All kinds of frames are suitable. Just pay attention that the size of the frames should be proportional to the size of the face. Especially women with ellipse faces can properly choose the frame of any design, but they had better not use a straight-line frame, namely, too tall too flat frame.
Virtual try-on service
Previously, the only way to buy glasses online was by looking at pictures or reviews. But no matter how real the picture is and how good the buyer's feedback is, more than 80% of them will feel inappropriate once they try it on their face. Either the glasses don't match the shape of the face, or the color doesn't match the skin tone, etc.AR glasses virtual try-on can realize glasses online try-on. Using the phone's camera, users can look at the glasses and try them on their faces. They can turn their head in real-time to see how the glasses look at different angles. Online shopping should be tried on before purchase.
Color process of Contact lenses
Pigment printing process
It refers to the direct printing of pigments or patterns on the inside of the lens and then drying, which is the main production process of poor-quality chromatic contact lenses. Usually, small factories and small workshops use this method. The lens is being phased out because the pigment can easily seep out from the surface during wearing, causing discoloration and staining, and irritation to the eyes, which is a big risk.
Pigment build-in process
To be specific, the lens made by sandwich technology is a three-layer structure, the front and rear are colorless transparent layers, and the middle is a colored layer. After the processing of sandwich technology, the color layer is wrapped in the middle of the front and rear transparent layer, so that the pigment will not contact the eyes, which will not cause irritation and injury to the eyes. The downside of this process, however, is that the lenses are slightly thicker than normal contact lenses and are less oxygen-permeable, so they are not suitable for long-term wear.
The pressed film manufacturing process
This is a relatively new method of a similar sandwich process, and the color (pattern) is also made between the front and rear layers of the lens. But the color (pattern) is used to fill in the film process. During lens curing, the pigment seeps into the material instead of sticking to the surface. It feels as if the lens is covered in color within a single layer. This reduces the middle layer and makes the lens thinner, which naturally makes it more comfortable and permeable to oxygen.