What are bifocals?
A bifocal lens is a lens with two focal points. Because of the imaging principle of the lens, even half of the lens can still present a complete image, and the two images do not interfere with each other. In the past, both short-sighted glasses and presbyopia glasses were called single-focal lenses, which had only one focus. Later it developed to the bifocal lens, and the same lens is divided into upper and lower two parts. The upper part of that lens is used when seeing far, and you look down when seeing close objects, just the reading distance, naturally used the second half.
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What Are Standard Progressive Lenses?
Standard progressive lenses are a type of progressive lens with plenty of room at the bottom for your near vision. If you need to see something far away and up close, such as a book or magazine, this lens is for you. Transitioning between these viewing areas is often painless for your eyes.
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What is a progressive lens?
Progressive multifocal lenses are lenses with different upper and lower powers for seeing far above and below for seeing near. The distance from the fixed far power above the lens to the near power fixed below the lens does not change suddenly, but a gradual transition between the two through the gradual change in refractive power. Compared with ordinary lenses, there are many advantages. The appearance of the lens is like a single vision lens, and the dividing line of the power change is not visible. Not only is the appearance beautiful, but more importantly, it protects the age privacy of the wearer, and there is no need to worry about revealing the age secret due to wearing glasses.
Since the change of the lens power is gradual, there will be no image jump. It is comfortable to wear and easy to adapt. So it is easy to be accepted. Because the degree is gradual, the replacement of the adjustment effect is gradually increased according to the shortening of the short distance. There is no adjustment fluctuation, and it is not easy to cause visual fatigue. Clear vision can be obtained at all distances in the visual range.
Such a pair of glasses meets the use of long-distance, near-use and various distances in the middle at the same time. It is especially good news for teachers, doctors, music workers, and computer operators, because these people not only need to see far and near objects clearly, but most of the time they also need to be able to see middle distance objects such as blackboards, piano scores, and computer screens. . This is not possible with any lens other than progressive lenses.
Are titanium glasses frames worth it?
In order to exert the flexibility of the material, the β titanium frame is designed to be mostly fine and delicate, and the style is limited by this. So the price of a pure titanium glasses frame is more expensive than the beta titanium frame, of course, the comfort is higher. Beta titanium has better strength, fatigue resistance, and environmental corrosion resistance than pure titanium and other titanium alloys. It has good shape plasticity and can be made into wire and sheet, which is lighter.
Because the texture of pure titanium frame is better, so it is more expensive than other frames, at least should the price reach more than 20 dollars, if the frame is only a few dozen dollars, then it must be fake and inferior. The most important thing to avoid buying fake products is to choose brands. For example, Seiko and other well-known brands rarely have fake and inferior products, so that consumers can be more assured to buy.
What is night blindness?
Diminished night vision can also be called night blindness. When you suffer from night blindness, it does not mean that you can't see anything at all at night. This means that you have difficulty driving or seeing things in dark or dim lighting conditions. Night blindness also makes it difficult for the eyes to change from bright light to dim light. This is why night driving in oncoming vehicles can be challenging for some people with night blindness.
Many people have experienced a condition called night blindness, which can make driving at night difficult. Driving glasses at night should help alleviate this situation. However, research shows that night driving glasses are generally ineffective.
If you encounter problems while driving at night, please make sure that all reflective surfaces in your car are clean and free of dirt. You should also see an ophthalmologist determine the cause of the problem. Many causes of night blindness can be easily corrected, making you and others safer during the journey.