what are non prescription glasses? | KOALAEYE OPTICAL

what are non prescription glasses?

The lifetime of contact lens

Traditional type: the replacement cycle is more than 3 months, not more than 1 year, that is, we say we abandon after one season, and we can abandon after half a year and a year.

Frequent-change type: the replacement cycle is more than 2 weeks, not more than 3 months, that is, we often say that we throw them after 1 month or two weeks.

Abandoned type: as a one-time use, common for the day use.

Contact lenses, like food, have an expiration date. For example, the shelf life of daily contact lenses is one day (after it is opened), and can not exceed this time. And the life span of a pair of glasses depends on how long you use them each day. Although different lens materials determine different wear times, we recommend that soft lenses should not be worn for more than 8 hours per day (do not wear soft contact lenses to sleep). Traditional contact lenses can be used for a long time, so the lens is easy to produce protein-lipid deposition, and then they are easy to cause eye surface inflammation and hypoxia reaction. If conditions permit, it is recommended to choose the frequent-change type and discard type, the shorter the cycle, the healthier.


Plate glasses frame

Sheet glasses frames are generally made of high-tech plastic memory sheets. Its appearance is beautiful and fashionable, and its styles are diverse. Therefore, plank glasses are easier to match with clothes, which can show the personality and style of the wearer.



What should drivers notice when wearing polarized glasses?

Many drivers like to wear polarized lenses. Indeed, the polarized lens can reduce strong light, eliminate glare, so that the line of sight is natural and soft, but the polarized lens is more suitable for fishing, skiing, and other large areas of the reflective environment. Drivers sometimes have to face the tunnel and another dark scene, the polarized lens is easy to make people suddenly feel dark at the moment. In addition, polarized lenses can make LCD screens and LED traffic lights dim. Therefore, when choosing polarizers, it is best to choose good quality optics, and when going through the tunnel, it is best to take off your glasses ahead of time and blink a lot. Before wearing the driver polarizing lens, try it on and observe whether the polarizing film of the lens is smooth. If the polarizing film is uneven, there will be inflow in the imaging, which may lead to visual fatigue and migraine.


RIVBOS Polarized Sports Sunglasses for Driving

TAC Polarizing Lenses - RIVBOS lenses are made from cellulose triacetate (TAC) material. TAC has quality optical properties that prevent the shrinkage of PVA polarized light film and has high strength surface scratch resistance. They help restore the original color, eliminate reflected and scattered light, and provide perfect eye protection. Rivbos frames are made from durable TR90 material. These polarized sunglasses feature flexible, stress-resistant frames that are able to withstand pressure without breaking. Whether it's sports or casual, you can show off your unique style.



Titanium frame machining is complicated.

The elastic modulus of titanium alloy is small, which is easy to produce large deformation, springback, distortion, and vibration in cutting, resulting in poor geometric shape and accuracy of the workpiece. As the surface roughness increases, the tool wear increases. The thermal conductivity of titanium alloy is poor and its thermal conductivity is small, 1/6 of that of 45 steel, so the high heat generated in processing cannot be effectively diffused. It is even harder to use titanium to make glasses. The frames are very thin and a lot of fine work is demanded. It's definitely a challenge for titanium, which is pretty difficult to work with. In addition, titanium alloy frames involve titanium alloy welding technology, which is more difficult.


What Are Trifocal Lenses?

When you are over 40 years old, your eyes may become old, too. Your corrective lens requirements may become increasingly unique, Most people are familiar with bifocal glasses but unfamiliar with trifocal glasses. So, in this post, we will show you what trifocal glasses are.

Trifocal lenses have three different corrective lenses within one lens to offer you intermediate, distance, and near correction, all in one pair of glasses. The varying levels of correction cab are laid out in a couple of different ways to ensure the layout suits your unique vision needs and comfort level.

The near vision is to correct close-up vision, the intermediate vision is often used for card playing and staring at the computer screen fall with this range of vision, and the distance vision is often used for driving or looking at a whiteboard.


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Can You Wear Blue Light Glasses All Day?

Can I wear blue light glasses all the time? You may also have the query. To answer this question, you need to know one thing that the blue light isn’t inherently bad for you but an excess of blue light will lead to some negative effects.

The natural sources of blue light from the outdoors and from sunlight is good for you. In addition, since the HEV wavelengths is important to our moods and sleep rhythms, blue light can be used to treat seasonal effective disorder and other mental health issues.

The blue light glasses is used to guard against artificial source of blue light that deliver excessive amounts of this wavelength to your retinas. So, if you need to stay daytime hours under artificial light or working at a computer, you had better wear your blue light blocking glasses during the day.

So, is it bad to wear blue light glasses all day? The answer is negative.

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