how much do bifocal lenses cost?
Sun, Apr 03, 22 By : Koalaeye
Clean your glasses correctly. The dust of the lens will be washed (lightly), and then use a neutral detergent (cleaner) to clean. You can also buy professional glasses cleaning fluid, finally clean by water, and then use a professional glasses cloth to wipe. If the lens is covered with dust and particles before wiping, it is best to wash it with water and then gently dry it with a cloth. Testing of aspheric lens The optical axis of the optical...

Clean your glasses correctly.

The dust of the lens will be washed (lightly), and then use a neutral detergent (cleaner) to clean. You can also buy professional glasses cleaning fluid, finally clean by water, and then use a professional glasses cloth to wipe. If the lens is covered with dust and particles before wiping, it is best to wash it with water and then gently dry it with a cloth.


Testing of aspheric lens

The optical axis of the optical center just overlaps with the visual axis of the eye, which is the most ideal state. Because the light from the edge cannot form a focus on the optical axis, when the optical axis does not overlap with the visual axis (the difference is greater than 2mm), such unclear and scattered imaging results will occur. When choosing frames and aspheric lenses, you need to ensure that they fit correctly, to achieve the best visual and decorative effects. Simply put, due to the special design of the lens, we found through a calculation that the optical center should move down 1mm higher than the pupil for every 2° increase in front inclination angle. Otherwise, the wrong pupil height will cause the lens to look like astigmatism, and cause discomfort. For glasses with aspheric lenses, there must be an inclination angle after wearing. The specific angle varies from person to person.



The TR90 Spectacle Frame

TR90 frame is a kind of polymer material spectacle frame with memory, no chemical residue is released, and it meets European requirements for food-grade materials. It is currently an internationally popular ultra-light spectacle frame. TR90 frames have the characteristics of super toughness, impact resistance and abrasion resistance, and low friction coefficient, which can effectively prevent damage to the eyes and face caused by the breakage and friction of the frame during sports. Because of its specific molecular structure, it has good chemical resistance, is not easy to deform in high temperature environment, can withstand high temperature of 350 degrees in a short time, and is not easy to melt and burn. Moreover, the TR90 spectacle frame has a lubricating surface with a density of 1.14-1.15. It will float when placed in salt water. It is lighter than other plastic spectacle frames. It is about half the weight of the sheet frame and 85% of the nylon material. It can reduce the burden on the bridge of the nose and ears.


Does the phone screen have irregular color bars when wearing polarized lenses?

It is mainly the special properties of the polarizing film. The polarizer is able to see the internal stresses in the plastic, so when we usually look at the edge of the mobile phone screen, it will have a colored stripe or a black piece, which is mainly caused by the uneven edge pressure when the screen is installed. It's mostly a matter of light and shade. Wearing a polarized lens to see the LCD screen a tilt will find that the screen darkens, mainly because the polarizing lens can absorb light in a certain direction. The LCD screen is a one-way light (different from sunlight), so it is absorbed, so it is found to be dark.



The effects of night blindness on driving

As we age, our pupils will be narrow little by little, so they can't dilate as quickly. The smaller the pupil, the less light reaches the retina, making it harder and harder for the retina to see at night. This is called night blindness, and it's a condition that makes it difficult for your eyes to adjust from bright light to dim light. This makes driving at night especially stressful in your 50s, 60s, and beyond.


Be sure to wear qualified glasses.

Many people are eager to buy glasses online without the necessary checks at a proper optical center for glasses. But, in reality, these tests are not only to replace glasses but to take responsibility for the safety of their own eyes. These cheap and inferior glasses will do a lot of harm to most myopic friends. If you wear unqualified glasses, it will cause visual fatigue, headache, dizziness, nausea, and other symptoms, vision loss. Severe cases can lead to amblyopia, strabismus, or other functional impairments.



Many traditional optical stores are complaining about a drop in customer numbers. When we analyze it, we find that the decline in customer numbers is divided into two aspects. The first is the decrease in new customers, which is mainly because the Internet and eye hospitals are fighting for customers from optical stores. The other is the loss of old customers, which is entirely because the optical store did not do the best service, especially the after-sales service.

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