Optical Components

Optical ComponentsGlasses contain two parts: a frame and lenses .

      Frames can be made ​​of metal or plastic or a combination of the two make up a page with two slots for eyewear lenses . And I wear glasses for the ears . The plastic used to make eyeglasses are 2 kinds of soft plastic , which is very flexible . And a portfolio of flexible plastic , hard plastic , so soft , so I have broken less than solid . Metal parts used to assemble the frame . There are many types of stainless steel nickel -titanium In case of non -titanium . Frame weight is heavier, and the chance of rust or allergies you may have , especially nickel . Frame of some kind of metal -free nickel -free metal (nickle free) may help reduce allergic to it. The gold-plated or gold -plated frame is also important . If gold is good , it will peel less.
      Lenses made ​​of plastic or glass. A convex or concave lens tilt This has many advantages over plastic lenses are lighter than glass does not break easily . The disadvantage is that there may be floating on the surface scratches easily. Generally, lenses , ophthalmologists rarely recommend . Because of the danger of glass breakage due to accidental lens . May cause permanent loss of sight . In addition, Lens plain The lens also has several special features to add to the other as a lens .

- The hard coating to reduce scratches.
- Multicoat coating to reduce the reflection of light that enters the eye, causing vision clearer .
- Miniature lens is a lens that has a refractive index greater than normal lenses are thinner than normal lenses and are recommended for use in cases where the very sight of lenses to reduce weight to a minimum.
- Double lens is a lens that can be clearly seen , far and near . But you can see the seam between the lenses . However, some people may not like the interface of the lens. They may choose to remove the lens from the lens .
- Multi-layer or multi-focal lenses (progressive lens) is the lens that makes it look both far and near term and no clear boundaries between each lens .
- Change the color of the lens is a lens that has special properties when exposed to sunlight . Or outside the lens to change the color to deepen yourself to the sun . But in time it will fade into the shade of lens as clear as ever.