what does eye size mean in glasses? | KOALAEYE OPTICAL

what does eye size mean in glasses?

What Are Varifocal Glasses?

Varifocal glasses, also known as varifocals, varifocal lenses, or progressive lenses, have a gradual change in strength from the top of the lens to the bottom with multiple focal points in between. Unlike bifocals, varifocals glasses have no specific area of lens strength, but progressive lens zones.

As mentioned above, varifocal glasses have three different prescriptions in one pair of glasses, allowing you to correct near and far vision. So, they bring you great convenience since you don’t need to change the glasses frequently.

However, there are also some common problems with varifocal glasses and we will show you the disadvantages of varifocal glasses.

So, in the following section, we will show you the disadvantages of varifocal glasses.


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.



Operation and Requirements of Drop Ball Test

The ball, which is 0.625 inches in diameter and weighs 0.56 ounces (16 grams), falls from 50 inches (127 centimeters) and hits the center of the lens. The geometrical center of the lens should be struck by the ball within a circle 5/8 inches in diameter. If the lens does not break, it is called a safety lens. There can't be anything that restricts the ball from falling. It cracks across the entire thickness, containing laminated layers (if any), and divides into two or more separate sections across the entire diameter.


Choose the right frame for your face.

People who have bought glasses in a physical store usually know what kind of frame fits them. Do not blindly choose vintage-style glasses according to your preference. Measure the distance between the temples of your old glasses so that the new ones are comfortable to wear. The General online glasses style is very rich. Because there is no shop rent and middlemen, the price is much cheaper than the traditional glasses shop.



What are the best night driving glasses to buy?

While lights on the road can make for a safer driving environment, they can take a toll on your eyes. If you often drive at night and feel eye strain or difficulty seeing in low light. If two cars are driving opposite each other at night and bright lights are turned on, it is almost impossible for the drivers of both cars to see the road ahead because the light is so annoying to the eyes. You might want to think of wearing a pair of night driving glasses.


Who looks good in transparent glasses?

Transparent glasses look good on almost all face shapes and skin tones for both men and women. Due to their versatility, they can mix and match with almost every outfit on any occasion. They are neither too old-fashioned nor showy among the crowd. You can confidently carry them with your office look and also, there is no problem hanging out with your friends.


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How to clean the lenses?

When wiping lenses (especially the rimless glasses of resin lens), you must use a special wipe lens or soft handkerchief or paper. When you wipe the lens, you can only wipe it in one direction, not in circles, and don't touch the lens with your fingers. When the lens is stained with dust and sand, it should be washed with water before wiping, otherwise, the lens is likely to be abraded, and the operation should be gentle. At ordinary times, when cleaning, do not exert too much force, pay attention to the grasp of strength. When wiping the lens, it is best to take the side frame with one hand, and the other hand takes the glasses cloth to wipe gently. In order to prevent the lens film layer falls off, do not use alkaline detergent to wipe the lens. Therefore, when bathing or playing at the seaside, glasses should be properly kept to avoid water vapor or seawater caused by corrosion of glasses.

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