Which is better, MR7 lens or MR8 lens?
The refractive index of MR7 is 1.67, and its Abbe number is 32, so it has a good dyeing property. MR8 has a refractive index of 1.60 and an Abbe number of 40 or more. MR8 has stronger toughness, so it is more tensile and is not easy to break when confronted with strong impact. The lenses of MR7 and MR8 are different in the degree of heat resistance, and the heat resistance of MR7 is slightly weaker. MR7 is recommended if you want thinner and lighter lenses, but MR8 is recommended if you want higher light transmittance.
How to choose rectangular glasses?
Look at the facial features in the aspect of proportion. If your features are delicate, which makes you look petite, you can choose some wider glasses so that you will increase your mental outlook, making your features prominent. On the other hand, if your features look solid and take up a large space of your face, go for narrower frames, because wider frames will make you look tired and add weight to your head.
Have a try and confirm the front and side of the glasses.
Confirmation data: pupil height, flat frame surface, size of frame surface, the harmony of nose arc, the contact area of nose support, size of temple bend. Finally, remember a big principle: You should have no sense of pressure, and in a small range of motion, the frame does not shift. Good glasses should be perfectly integrated with the face so that people can not feel the existence of glasses. Good design is invisible. The lens above 800 degrees will be slightly heavy, so it is not recommended to choose the elastic temple and smooth metal temple. The temple is too slender, and at the same time is all metal, easy to slide frequently.
Should you choose titanium or pure titanium frames?
In reality, there is no absolute good or bad, if it is comfortable to wear, suitable for personal preference. They are good glasses for a single person, because if someone else wears the right and good-looking glasses, you may not wear the right and good-looking glasses yourself. Therefore, it is still a specific problem, with specific analysis, suitable for their own is good.
How to adapt to progressive lenses?
People who are prone to motion sickness or have inner ear diseases may suffer dizziness, nausea, vomiting, and other symptoms due to their inability to tolerate the slight deformation of the visual objects, so they need to pay more attention when wearing them. For people who have not worn reading glasses before, it is not recommended to wear graded multi-focus glasses directly because their eyes will not be able to adapt quickly.
About Prism Glasses
The refractive index of the same medium is different for different colors of light. Different colors of light travel at different speeds in the same medium. Because the same medium has a different refractive index for various monochromatic light, and the deflection angle of each monochromatic light is different when passing through a prism. Therefore, white light through a prism will separate the monochromatic light, known as dispersion. What is the prism effect of glasses? As long as there is a deviation between the visual channel of the eye and the optical center of the lens, it can produce a prism effect. Therefore, the severity of the prism effect can be used to measure whether the glasses with the correct prescription are processed correctly and reshaped correctly.
Optical laboratory
The two main laboratories provide different services. The Eyewear Repair Lab is made up of two technicians to provide solutions to the most difficult repair work for network eyeglasses repair customers. The prescription lab is staffed by optometrists and tasked with delivering about 30 prescription orders a day to retail customers and Internet customers. The lab is in charge of cutting lenses, forming rimless and semi-rimless frames bit mounting, edging, and finishing, and has anti-reflective and anti-UV coatings.They provide very competitive prices because all repairs are carried out in our own optical laboratory.
