How much do plano lenses cost?
If at big shop downtown, the price of the lens will exceed a hundred, but if you walk the campus store, will be a lot cheaper. Generally is 30-40 at least(not the poor quality, but the price is reasonable for students).UV protection, anti-fatigue, prevention of radiation, computer and television are the basic functions. In the campus store, it is several hundred or so, which can be matched with relatively good quality. Generally, the price of radiation-resistant resin lenses and frames is about 150. If you want to choose a better one, The price can be very high.
Disadvantages of bifocal glasses
The disadvantage of bifocal glasses is that the different areas are clearly spaced and the appearance is not beautiful. The medium distance is fuzzy, and the adaptation period is needed, there is a prismatic jumping phenomenon. The focal distance between the upper and lower lenses is different, with a clear dividing line. The main disadvantage is that when the line of sight moves from far to near, there will be interference like jumping, and the middle distance object image is blurred. Students can adapt to sitting still in a class by wearing bifocal glasses, but they can only wear glasses when they are in class or studying because of the inconvenience and even danger caused by the interruption of the glasses.
Types of aspheric lenses
There are two types of aspheric lenses: single aspheric surface (single aspheric surface for short, different from the outer aspheric surface and inner aspheric surface) and double aspheric surface (double aspheric surface for short). For the outer aspheric surface, convex is an aspheric surface and concave is a spherical surface. For the inner aspheric surface, a convex surface is a sphere, and a concave surface is an aspheric surface. In addition to correcting aberrations, the double aspheric lens also improves the effective field of vision compared to the single aspheric surface. When people's eyes look through the edge of the lens to see things, like driving when looking at the reflective mirror, it often affects vision because of the large aberration at the edge of the lens. Previous designs of aspheric plates have analyzed a single ray of light passing through the center of the pupil. Wavefront technology controls the entire beam of light passing through the pupil, eliminating high-order aberrations.
ATTCL Retro Polarized Night Driving Glasses
These glasses have metal frames. The metal frame uses an aluminum-magnesium alloy structure, strong and light. While you'll see them available in a variety of colors, you'll still have to choose the night vision option if you want to buy night driving glasses. The anti-glare yellow night lens is designed to filter 20 percent of glare at night.
The advantages are not the same.
The cellulose acetate frame is acetate plastic, belonging to a kind of thermoplastic material, and it is a material for nearly 20 years. It is widely used in the glasses industry material. Now with the progress of processing technology, it can be divided into plate and injection molding. The acrylic frame of the propionic acid fiber belongs to a kind of thermoplastic material. The appearance is transparent. The main feature is that the material density is high. They are hard to burn and are not easy to change color, with Impact resistance. It has softness, dimensional stability, and good processing formability. Many high-grade plate glasses are based on these high-quality plates, so the quality is more reliable. It is designed for a large number of people and the pursuit of quality of life students, especially for women.
Best Titanium Eyeglasses Frames Brand - EYEVAN
EYEVAN 7285 is a Japanese eyeglasses brand that represents both modern technology and traditional processing. It has been around for half a century and has one of the most interesting brand histories in the industry. For nearly half a century in business, the eyewear brand has been committed to providing high-quality and timeless eyewear design. Most importantly, EYEVAN has managed to give glasses a new look --- from a functional visual aid to a fashion accessory.
Bifocal Lens
Bifocal lenses have two observation areas separated by visible lines, a larger observation distance area, and a smaller reading area. It may take some time for people who are wearing bifocal glasses for the first time to get used to the lenses. This is mainly due to learning how to move the eyes between the observation distance area and the reading area. Some people will also find that there will be an 'image jump' phenomenon at the visible line between the distance and the reading area, especially for those with limited mobility, who must look down when walking. The best way to get used to bifocals is to wear them as much as possible.
