what is the average cost of prescription eyeglasses? | KOALAEYE OPTICAL

what is the average cost of prescription eyeglasses?

Beta titanium

β titanium refers to a particle titanium material that is completed by delayed cooling at the zero bound point state of titanium and does not belong to the alloy. Practical applications will often be processed into alloys to increase their applicability. Although the purity of β titanium is not comparable to pure titanium, its strength, fatigue resistance, and environmental corrosion resistance are better than pure titanium. It has higher strength than pure titanium and other titanium alloys, and the corrosion resistance is stronger and has better elasticity, It is not easy to deform, and is lighter.


The role of blue light blocking glasses

Blue light blocking glasses can effectively isolate ultraviolet rays and radiation, as well as filter blue light. They are generally used when watching computers, TVs and mobile phones. In daily life, especially office workers, they often feel eye fatigue, dry and sore eyes, which are all caused by staring at the electronic screen for a long time.

Blue light blocking glasses can effectively reduce the damage of blue light to the eyes. The blue light blocking lenses can effectively block harmful blue light within a certain distance, resist the damage of lens diseases to the eyes, and reduce the visual fatigue caused by blue light. Outdoors can also reduce the discomfort caused by strong ultraviolet rays to the eyes, and avoid the damage caused by ultraviolet rays to the eyes.

Our eye protection should be always all-time, and we can’t rely on blue light blocking glasses. It can only block some of the blue light’s damage to the eyes. Whether studying or working, you must pay attention to the rest of the eyes and try to reduce the brightness of the electronic screen. More importantly, developing good eye habits is better than anything else.



What Are Single Vision Lenses?

What are single vision lenses? You may have the same question. Single vision lenses have only one prescription for a given distance. Most reading glasses and distance glasses have single vision lenses because they are designed for people who are difficult in seeing either near or far. Some people are using their single vision glasses for both far and near depending on their types of prescription.

You can choose to wear single vision reading glasses to correct your eyesight if you have trouble reading text on your phone or computer screens. You can also wear single vision glasses to help you make out traffic signs while driving.

Single vision lenses for farsightedness are thicker at the center than those for nearsightedness, which are thicker at the edges. And the single vision lenses generally range between 3-4mm in thickness. The thickness varies depending on the size of the frame and lens material chosen.

After learning some information about one lens glasses, do you know the benefits of them? So, in the following part, we will show you the advantages of single vision lenses.


Jempinis Wood Deer Eyeglasses Holder from Bali, 'Studious Deer'

This charming eyeglass holder from Bali depicts a bold and complex industrious deer. Yudi Suardi designed this holder, hand-carved from jempinis wood, to depict the majesty of a deer. Your glasses fit right in the groove of the deer's head.



Parameters of lens material selection

Abbe number

Since the refractive index of the lens material varies for the light of different wavelengths, and white light is made up of various colors of light of different wavelengths, the dispersion phenomenon occurs when the lens refracts white light. The dispersion coefficient is an important index to identify the sharpness of lens imaging, which is usually indicated by Abbe number (Abbe number = dispersion coefficient). The larger the Abbe number, the smaller the dispersion, and vice versa, the smaller the Abbe number, the larger the dispersion, and the worse the resolution of the image.

Impact resistance

Humans have been using glass lenses for about 300 years, and it was not until 1947 that the first resin lenses made of CR39 were produced. A big reason for using resin lenses is their safety, i.e. impact resistance. Only lenses that pass the Drop Ball Test are considered safe. Combining the above two parameters, we can compare different lenses.


How do myopic glasses work?

The formation principle of myopia is that when the light from the outside world enters the eyeball, it is refracted by the eyeball's refractive system and cannot be accurately imprinted on the retina. The image is in front of the retina. If a concave lens is placed in front of the eye before the light enters the eye, it shifts the focus of the myopic eye from a point in front of the retina to the back, so that it lands directly on the surface of the retina. When parallel light passes through a concave lens, it diverges, meaning that it has already diverged once before entering the eye and then is refracted normally by the eye's refractive system. When the light is refracted through the eyeball, the distance of the image will be longer. So the distance of the image will be correspondingly pushed back compared to the non-divergent light. But it will just fall on the retina, and the image will be accurate in the right place.


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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.

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