What are curved sunglasses called? | KOALAEYE OPTICAL

What are curved sunglasses called?

How is Heartface? Leiendo What are curved sunglasses called? 6 minutos Siguiente how much are glasses at warby parker?

Refractive index of spectacle lens

It is generally believed that the higher the refractive index, the better the spectacle lens. Such spectacle lenses are relatively thin, and of course, the price is a bit expensive. When the refractive index increases, the direction of the light entering the lens will change greatly, the focus will move to the lens, the focal length will be smaller, and the diopter will become larger. In order to keep the diopter unchanged, it is necessary to reduce the curvature of the lens, that is, to reduce the curvature of the mirror surface, so that the thickness of the lens can be reduced. This is why the larger the refractive index, the thinner the lens is. Under the same premise of other things, the larger the refractive index, the thinner the lens, the lighter and more beautiful the lens, and the higher the price, but the larger the refractive index is not the better.


Uvex Stealth OTG Safety Goggles

They provide more protection and coverage than other prescription safety glasses. Due to the full seal around the eye, these OTG safety goggles prevent chemical splashes, and bumps, and scratches, making them wonderful general-purpose safety goggles to wear over your prescription glasses. Dura-Streme's scratch-resistant coating helps keep the lenses crystal clear, which is especially important when wearing the underlying glasses.



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 Are My Progressive Lenses Blurry?

Progressive lenses are optical lenses designed for simultaneous correction of far, medium and near. Progressive lenses use polishing technology to achieve a gradual transition between the two focal lengths. With progressive lenses, people do not have to switch their glasses for different purposes.

However, with the usage of progressive lenses, there are some problems of progressive voices. One of the most commonly reported side effects of progressive lenses is blurry or fuzzy peripheral vision. The blurriness is usually most noticeable through the lower portion of the lens and to the left and right of near and immediate zones.



5 Unbreakable Eyeglasses Frames

In this section, we will list the most durable eyeglasses frames and we will introduce them one by one.

Titanium: One of the most durable eyeglasses frames is the titanium eyeglasses frames. It is lightweight, strong, and flexible. So, titanium eyeglasses frames have lots of fans in the eyeglasses market. In addition, pure titanium is hypoallergenic. But, due to these features, titanium eyeglasses frames are expensive than other frames.

Stainless steel: Stainless steel frames have some spring in them, which resists breakage. Stainless steel also resists corrosion, giving it a longer life. However, stainless steel eyeglasses frames may be hypoallergenic, depending on the alloys used.

Nylon: many people like athletes like nylon frames because they are flexible, lightweight and unbreakable - at least in the short run. However, nylon frames may become brittle over time, which is something to think about.

Kevlar: kevlar eyeglasses frames used in bulletproof vests can survive strong impacts, making them a good choice for contact sports and high-risk jobs. It does not have a lot of flex, limiting its applications.

Flexon: besides the above unbreakable eyeglasses frame, we will introduce another brand-name metal - Flexon. Flexon has a unique capability for springing back to its original shape after it gets twisted and they are called memory metal.


BLUPOND Night Driving Glasses For Men/Women - HD Yellow Vision for Maximum Clarity - Knight Visor

The Knight Visor Glasses are equipped with high-definition night vision lenses for clear and sharp vision in dark environments. They protect your eyes from headlights. The glasses use amber optical filters that convert harsh white light to a soft, warm yellow to prevent eye fatigue and prolonged glare. The special semi-polarized light integration layer is designed to prevent harmful light waves from reaching your cornea, causing blurred vision and headaches. Ultralight frame, semi-polarized lens, integrated nose pad, and rubber support system can easily extend wearing time.


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Sports goggles

With the improvement of people's sports concept and sports protection concept, sports goggles are also widely welcomed. Safety glasses are worn during sports must have four major functions, safety (PC lenses), protection (TR-90 frame, soft and flexible), comfortable (non-slip nose pads and foot covers), and beauty (match sports and leisure clothing).

Sports goggles with shatter-resistant plastic lenses and side shields can prevent balls or sand from hitting the eyes. It can be fixed on the head without worrying about falling off during intense movements. The unique design of the rim of the frame makes the glasses very close to the human face and has a proper external isolation effect so that the human eye is not easy to be attacked by bacteria. The special lens has the functions of anti-fog, anti-shock, and ultraviolet rays, which is very suitable for outdoor activities.

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