Reading Glasses
At present, there are two prescriptions for reading glasses. One is to adjust the power of glasses with clear objects at close range, plus 1/3 of the power for adjustment. The other is to use low power that can see close objects clearly. The practice of many elderly people has proved that the latter one is better between two methods.
Which Glasses for Computer Are the Best?
There is no such a thing that one type of computer glasses can fit all or is the best for everybody. When selecting glasses for screen protection, the visual ability, personal preferences, the type of work, the distance between the computer user’s eye and the monitor, and other factors should also be considered.
Tortoiseshell frame
Tortoiseshell frame glasses can be said to break connotation completely, and this is a very stylish and slightly exaggerated style. It is recommended that fair-skinned, trendy hairstyle and stylish clothes should be worn by boys. After all, if you want to wear stylish tortoiseshell frame glasses, you need clothes and hairstyles to complement them. And if only wear the tortoiseshell frame glasses may not look good.
Basic principles of progressive lenses
The surface of the progressive slice is divided into five regions. There are far, middle, and near optical areas. They are respectively corresponding to see distant objects, middle distance objects in the near distance objects. One pair of glasses is multi-purpose. In appearance, it is not very different from regular lenses. There is no clear dividing line. Distal use area: The area above the progressive slice is the distal use area, which is used to correct the distal refractive error. Proximity area: from the matching lens cross down, the refractive power of the lens continuously increases the positive degree, which is used to see close objects. Gradient area: The channel connecting the far and near areas. It is an area of regular change from top to bottom, used for transitioning and seeing objects at intermediate distances. The length of the gradient is very important for the wearer's adaptation. The rate at which the degree of gradient changes is called gradient. The gradient can be uniform or variable. Peripheral area: Changes in the surface curvature of the lens will lead to aberrations in the peripheral areas on both sides of the lens, mainly astigmatism and prism effect, which will interfere with a vision to a certain extent, resulting in blurred vision or distortion. And it will affect the wearer's adaptation to the progressive lens.
You need to buy real titanium frames.
In general, titanium frames range from hundreds of yuan to thousands of yuan. Many store counters display frames called pure titanium, but if you look closely at the labels, there is no indication of the titanium content or composition. When you buy titanium frames, check if they are titanium or pure titanium. In reality, pure titanium glasses frame refers to the composition of titanium more than 99%, so you can use the weight to see if it is pure titanium. If the frame is heavy, it is definitely not pure titanium.
Do blue light glasses really protect your eyes?
Scientists at the University of Kansas in the United States summarized the results of studies around the world in the past 30 years and pointed out that there is not enough evidence in human trials to prove that blue light is related to macular degeneration, and there is no test showing that blocking blue light glasses are related to macular degeneration. Moreover, experts from the University of S?o Paulo in Brazil have observed after five years that patients who use anti-blue light intraocular lenses after cataract surgery have no difference in the incidence of macular disease compared with those who use ordinary intraocular lenses.
Pay attention to the wearing of myopia sunglasses when driving.
Some drivers are slightly myopic, usually driving without wearing a myopic mirror. There is no problem. But once you wear sunglasses, the problem comes: your eyes are more likely to tire and your vision will decline, just as your driving vision will be affected at night. Therefore, for the driver of slight myopia, there is no problem in usually driving, but if you want to wear sunglasses, you must be equipped with the lens of myopia degrees.
