Evolution of hard coating technology
The first generation of the use of hard coating technology began in the early 1970s, the quartz material is deposited on the surface of a resin lens under vacuum conditions, form a very hard anti-wear film. However, due to the mismatch between the thermal expansion coefficient and the film base material, it is easy to delaminate and crack the film. Instead, it forms the mottle on the surface of the lens, and the effect is not optimal.
The second generation of hard coating technology is the use of the 1980s. The surface of the resin sheet is coated with a material with high hardness and not easy to be brittle and cracked by an immersion process. At this time, anti-reflection coating lenses had appeared and gained the recognition of consumers, but the mismatch between adding hard coating and anti-reflection coating still caused serious lens wear.
The third generation of hard coating technology was developed in the 1990s, mainly in order to solve the problem of wear resistance after coating resin lenses with an anti-reflection film. The hardened material evolved into a polymer organic matrix material.
Fourth-generation coating technology is dominated by silicon atoms, in which the hardened solution contains both organic substrates. It contains inorganic ultrafine particles, including silicon elements, which make the hard coating not only tough but also hard.
Two Tone Glasses Black and White
Oversized two tone glasses frames can match almost any kind of style, from classy to cute. A pair of oversized two tone round prescription glasses are the perfect choice to make a strong first impression. This style is fun and friendly — perfect for projecting the best parts of your personality. The variety of unique oversized eyeglasses we have is extensive. With so many choices, including oversized clear glasses, it can be hard to narrow down which big glasses are the right choice for you. A good place to start is these fashion-forward favorites.
Do prism glasses have side effects?
Prism glasses do not have side effects. Prescription prism glasses are designed to help your vision. Prism glasses are not apparently different from general glasses in terms of thickness. It may take a few days to get used to wearing new prism glasses or newer prescription glasses. There may be some eye strain during this time.
For the different brand frames, the price is different.
Prada, Armani, Bvlgari, and other brands belong to the group of high-end eyewear brands (400-800 at a discount if the price is around 00-5000). Poly glasses, Bolon, Prosun, belongs to the middle-end glasses brand group (price 300-00 or so, discount price 300 or so): Serova and other products belong to the high-cost performance glasses brand (price 300 or less).
Functional zoning of the store
After determining its own positioning, the layout and functional partition of the optical store is very important. From the overall decoration to the details of the layout, they should reflect the professionalism and coordination of the optical shop. The general partitions of the optical shops include the eyeglasses business area, optometry room, contact lens wearing area, processing room, and cashier desk. The eyeglasses business area can be divided into more small modules separately. The division of the area should have a fixed standard. For example, the arrangement of this area can be selected according to the purpose, user group, occasion, and theme of the glasses.
A round face fits on a square frame.
The human face of a round face is shorter. So they had better match the slender frames that take curves slightly to reconcile the whole feeling. Angular and square frames are helpful to modify facial lines (prominent longitudinal lines). This can promote strengths and avoid weaknesses so that your face appears contour.
Types of Adjustable Glasses
Adjustable glasses come in different types including adjustable reading glasses, adjustable focus glasses and adjustable focus reading glasses.
Adjustable reading glasses have an adjustable focal length and compensate for refractive errors. They provide variable focusing so you can adjustable them for desired distance and prescription. They are often used for reading because you do not need to adjust the position of your eyes.
Adjustable focus glasses offer an adjustable focal length. They are used to correct refractive errors including presbyopia. They provide variable focusing so as to adjust the glasses for seeing things close up or far away.
Adjustable focus reading glasses are the same as adjustable reading glasses. You can adjust the dials of the glasses so you do not need to reposition your eyes to see objects clearly in the near or far.
