What Can A Dermatologist Do For Under-Eye Bags? | KOALAEYE OPTICAL

What Can A Dermatologist Do For Under-Eye Bags?

Best Eyeglasses For Women - KoalaEye

KoalaEye eyeglasses for women are designed in a special style and have a unique aesthetic feeling. They're sexy, feminine, and colorful. They can fully consider the wear comfort and appropriate display body shape. Koala Eye eyeglasses for women are a unique design that combines functionality and elegance, perfectly setting off the feminine temperament.


How to Choose Reading Glasses?

Find the right power. When choosing reading glasses, finding the right power would be the most important thing. All reading glasses will have signs or stickers indicating their power. In most cases, they will range from +1 to +4 diopter, in increments of +0.25. So, when choosing reading glasses, try the lowest power first.

Test-drive the glasses. If you have brought reading material with you, try reading it at a comfortable length. If you hold the material too far out to be able to read it, you should increase the power. Keep testing the differences powers until can read clearly at the distance that’s more comfortable for you.



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.


Choose the right lenses for blue light glasses.

Since visible light is made up of yellow, green, and blue light, the blue lens blocks the blue light, leaving only yellow and green light. Yellow plus green is yellow, so what we see is a yellow lens. If it is viewed from the side, we will find that the lens is also transparent, with no background color, and most of it is yellow-green. The dark yellow blue lens appears chromatic aberration, and it can be more serious. So to block blue light and do not hurt an eye again, you had better choose light yellow lenses to prevent blue light.



How to wear clear frames with style?

A square face is all about softening the lines of the face, so it works well with round frames. The person with a long face should choose a bit bigger frame. It can make the proportion of the face-up and down more harmonious. The oval face is the standard face shape, and any frame is suitable. People with round faces are similar to those with square faces. If you have a round face, you can choose a square frame instead of a round frame, which will only make your face look rounder. The most important feature of a diamond face is high cheekbones, so choose a thick frame to visually weaken the cheekbones. For the triangular face, people can choose the frame of a half-frame design. Since the upper part of the face will be smaller in this shape, a half-frame design is necessary to balance the proportions.


The refractive index of lens

Refraction law is discovered by Dutch mathematician Snell.It is the law that determines the direction of refracted light in the phenomenon of light refraction. When the light from the first medium (refractive index N1) into the second medium (refractive index N2), part of the light from the first medium into the second medium at the smooth interface will be refracted. The index of refraction is the ratio of the speed at which light travels in a vacuum to the speed at which light travels in the medium. For glasses lenses, the higher the refractive index, the thinner the lens, that is, the lens with the same center thickness and the same degree, the lens with the higher refractive index has thinner edges than the lens with the lower refractive index of the same material.


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Polycarbonate vs Trivex Lens: Which One Is Better?

We have introduced what the polycarbonate lens and Trivex lens are. What are the differences between the polycarbonate lens and the Trivex lens? So, in this section, we will show you the differences between these two lens materials.

  • Thickness:Polycarbonate glasses are about 10% thinner than Trivex lenses.
  • Weight:Polycarbonate glasses are around 10% heavier than the Trivex lens.
  • Optics - central:Trivex lenses have less internal stress and may produce sharper central vision than polycarbonate lenses.
  • Optics - peripheral:Trivex lenses have a higher Abbe value so they can produce sharper peripheral vision with less chromatic aberration than polycarbonate lenses.
  • Impact resistance:Polycarbonate and Trivex lenses have comparable impact resistance.
  • UV protection:Both polycarbonate and Trivex lenses can block 100 percent of the sun’s harmful UV rays and provide protection for your eyes.
  • Availability:Polycarbonate lenses have a wider variety of lens designs than Trivex lenses.
  • Cost:Trivex lenses are expensive than polycarbonate lenses.

As for Trivex vs polycarbonate, you may have known some information from the above part. You can choose either lens material based on your like when purchasing the glasses.

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